Answer:
The answer to your question is it sold 7 cakes.
Step-by-step explanation:
Data
cakes = c = $5
pies = p = $7
total pieces = 15
total sell = $91
Process
1.- Write equations to solve this problem
c + p = 15 ------------ l
5c + 7p = 91 ----------- ll
2.- Solve the system of equations by elimination
Multiply equation I by -5
-5c - 5p = -75
5c + 7p = 91
0 + 2p = 16
Solve for p
p = 16/2
p = 8
3.- Substitute p in equation l to find c
c + 8 = 15
solve for c
c = 15 - 8
c = 7
4.- Conclusion
It sold 7 cakes and 8 pies.
Answer: 7 cakes were sold.
Step-by-step explanation:
Let x represent the number of cakes that were sold.
Let y represent the number of cakes that were sold.
The cakes are $5 and the pies are $7. The store makes a total of $91. This means that
5x + 7y = 91- - - - - - -- -1
The store sold a total number of 15 goods. This means that
x + y = 15
Substituting x = 15 - y into equation 1, it becomes
5(15 - y) + 7y = 91
75 - 5y + 7y = 91
- 5y + 7y = 91 - 75
2y = 16
x = 16/2 = 8
x = 15 - y = 15 - 8
x = 7
there are 27 students in mrs. Yean's homeroom. 12 of them have home computers how many students don't have a home computer?
Answer: 15
Step-by-step explanation:Do 27-12 and you get 15
Answer:
15 students don't have a home computer
Step-by-step explanation:
Take the total amount of students, which is 27 and take the amount that do have home computers, which is 12, and subtract.
So, 27 - 12 = 15
Veterinarians often use nonsteroidal anti-inflammatory drugs (NSAIDs) to treat lameness in horses. A group of veterinary researchers wanted to find out how widespread the practice was in the United States. They obtained a list of all veterinarians treating large animals, including horses. They sent questionnaires to all the veterinarians on the list. Such a survey is called a census. The response rate was 40%. Which statement is NOT correct?A.Such a low response rate has the potential for response bias.B. The intended sample consisted of the target population.C. The chance to be selected into the sample was the same for all veterinarians.D.The sample was a volunteer sample.
Answer:
C. The chance to be selected into the sample was the same for all veterinarians
The statement that is NOT correct is D. The sample was a volunteer sample.
Explanation:The statement that is NOT correct is D. The sample was a volunteer sample.
The given scenario describes a census survey, where questionnaires were sent to all veterinarians treating large animals. In a census survey, every member of the target population is included, so there is no sampling involved. Hence, there is no opportunity for the sample to be a volunteer sample. Therefore, option D is the incorrect statement.
A low response rate, as mentioned in option A, can lead to response bias because the respondents who choose to participate may have different characteristics than those who do not respond. The intended sample, as mentioned in option B, was the target population of veterinarians treating large animals. And option C is correct since all veterinarians on the list had an equal chance of being selected as part of the survey.
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Express each of these mathematical statements using predicates, quantifiers, logical connectives, and mathematical operators.
a. The product of two negative real numbers is positive.
b. The difference of a real number and itself is zero.
Answer:
a. a × b > 0 ∀ a,b ∈ R : a,b < 0
b. a - a = 0 ∀ a ∈ R
Step-by-step explanation:
a. Let a and b be the numbers. Since it says product of two numbers is greater than zero, we write a × b > 0. Since a and b are real numbers, we write a,b ∈ R where ∈ denotes element of a set and R is the set of real numbers. We then use the connective ∀ which denotes "for all" to join a × b > 0 with a,b ∈ R. So, we write a × b > 0 ∀ a,b ∈ R. Since a and b are negative, we write a,b < 0. We now use the connective : which denotes "such that" to combine a × b > 0 ∀ a,b ∈ R with a,b < 0 to give a × b > 0 ∀ a,b ∈ R : a,b < 0. So, the expression is
a × b > 0 ∀ a,b ∈ R : a,b < 0
b. Let a be the number. Since we are looking for a difference, we write a - a. Since it is equal to zero, we write a - a = 0. Since a is an element of real numbers,R, we write a ∈ R, where ∈ denotes "element of". So, a ∈ R denotes a is an element of real numbers R. We combine these two expressions with the connective ∀ which denotes "for all" to give a - a = 0 ∀ a ∈ R. So, the expression is
a - a = 0 ∀ a ∈ R
The mathematical statements given are translated into logical expressions with predicates, quantifiers, logical connectives, and mathematical operators. The first statement is written as ∀x∀y ((x < 0 ∧ y < 0) → P(x, y)), and the second as ∀x (D(x, x)).
The mathematical statements can be expressed using predicates, quantifiers, logical connectives, and mathematical operators as follows:
For the statement 'The product of two negative real numbers is positive':
Let the predicate P(x, y) represent 'the product of x and y is positive', where x and y are real numbers. Then, the statement can be written as:
∀x∀y ((x < 0 ∧ y < 0) → P(x, y))
This translates to: 'For all real numbers x and y, if x and y are both negative, then the product of x and y is positive.'.
For the statement 'The difference of a real number and itself is zero':
Let D(x, y) be a predicate that states 'the difference of x and y is zero'. Then, the statement can be formulated as:
∀x (D(x, x))
Which reads as: 'For all real numbers x, the difference of x and itself is zero.'.
Therefore, The first statement is written as ∀x∀y ((x < 0 ∧ y < 0) → P(x, y)), and the second as ∀x (D(x, x)).
PLEASE HELP ASAP!!! I NEED CORRECT ANSWERS ONLY PLEASE!!! I NEED TO FINISH THESE QUESTIONS BEFORE MIDNIGHT TONIGHT.
Find m∠S.
Write your answer as an integer or as a decimal rounded to the nearest tenth.
m∠S = °
Yo sup??
we can solve this question by applying trigonometric ratios
let the angle S be x, then
sinx=2/5
x=23.6
Hope this helps.
Answer:
m∡S = 23.6 °
Step-by-step explanation:
We can see that this is a right angled triangle and therefore we can use trigonometric functions to determine an angle ∡S.
We know that:
[tex]\sin \angle S = \frac{opposite}{hypotenuse}[/tex]
Therefore:
[tex]\sin \angle S = \frac{2}{5}[/tex]
It yields:
[tex]\angle S = \sin^{-1} \frac{2}{5} =\sin^{-1}0.4[/tex]
Inserting that into the calculator we obtain m∡S = 23.6 degrees
A binomial probability experiment is conducted with the given parameters. Use technology to find the probability of x successes in the n independent trials of the experiment n=8, p=0.6, x<4
The probability of having fewer than 4 successes (x < 4) in 8 independent trials with a success probability of 0.6 is 0.1758.
We have,
The binomial probability formula:
[tex]P(x) = (^nC_x) p^x (1-p)^{n-x}[/tex]
Where:
P(x) is the probability of x successes
n is the number of trials
p is the probability of success
nCx is the binomial coefficient, which represents the number of ways to choose x successes from n trials
For the given parameters:
n = 8
p = 0.6
x < 4
For x = 0:
[tex]P(0) = (^8C_0) (0.6^0) (1-0.6)^{8-0}\\= (1) (1) (0.4)^8[/tex]
= 0.0016
For x = 1:
[tex]P(1) = (^8C_1) (0.6^1) (1-0.6)^{8-1}\\= (8) (0.6) (0.4)^7[/tex]
≈ 0.0092
For x = 2:
[tex]P(2) = (^8C_2) (0.6^2) (1-0.6)^{8-2}\\= (28) (0.6^2) (0.4)^6[/tex]
≈ 0.0412
For x = 3:
[tex]P(3) = (^8C_3) (0.6^3) (1-0.6)^{8-3}\\= (56) (0.6^3) (0.4)^5\\= 0.1238[/tex]
Now, sum up these probabilities to find the probability of x < 4:
P(x < 4) = P(0) + P(1) + P(2) + P(3)
≈ 0.0016 + 0.0092 + 0.0412 + 0.1238
≈ 0.1758
Therefore,
The probability of having fewer than 4 successes (x < 4) in 8 independent trials with a success probability of 0.6 is 0.1758.
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In the image below, DE ∥ BC. Find the measure of EC. Set up a proportion and solve for the measure. Show your work and label your answer. PLEASE HELP ME !!
Answer:
EC = 1 ft
Step-by-step explanation:
DE // BC and AC and AD are transversal lines
∴ ∠E≅∠C ⇒ corresponding angles are congruent
∠D≅∠B ⇒ corresponding angles are congruent
∠A≅∠A ⇒ Reflexive property
∴Δ ADE is similar to ΔABC by AA postulate
So, The corresponding sides are in proportion.
[tex]\frac{AC}{AE} = \frac{AB}{AD}[/tex]
AE = 4 ft , AD = 8 ft , AB = 8 + 2 = 10 ft
AC = AE * AB/AD = 4*10/8 = 40/8 = 5 ft
EC = AC - AE = 5 - 4 = 1 ft
So, the Length of EC = 1 ft.
An oil exploration firm is formed with enough capital to perform ten explorations. The probability of a particular exploration being successful is 0.1. Assume that the explorations are independent. Find the mean and variance of the number of successful explorations.
Answer:
a) Mean = 1
b) Variance = 0.9
Step-by-step explanation:
We are given the following in the question:
P(Success of exploration) = 0.1
Then the number of adults follows a binomial distribution, where
[tex]P(X=x) = \binom{n}{x}.p^x.(1-p)^{n-x}[/tex]
All the explorations are independent.
where n is the total number of observations, x is the number of success, p is the probability of success.
Here n = 10, p = 0.1
a) Mean number of successful explorations
[tex]\mu = np = 10(0.1) = 1[/tex]
b) Variance number of successful explorations
[tex]\sigma^2 = np(1-p) = (10)(0.1)(1-0.1) = 0.9[/tex]
Ms. Petrie buys some peaches for $4.95 and some breakfast cereal for $7.85. Ms. Petrie had $50 before she went shopping. How much mone does Ms. Petrie have left after she buys the peaches and cereal?
Answer: she has $37.2 left.
Step-by-step explanation:
Total cost of the peaches that Ms. Petrie bought is $4.95.
She some breakfast cereal for $7.85. The total amount that she spent in buying the peaches and cereals would be
4.95 + 7.85 = $12.8
Ms. Petrie had $50 before she went shopping. Therefore, the amount of money that Ms. Petrie have left after she buys the peaches and cereal would be
50 - 12.8 = $37.2
4x = 8x − 1
x = three fourths
x = 1
x = 3
x = 6
The answer is 1/4. Set up a proportion to solve for x. Another way is to use unit analysis.
Explanation:The answer is 1/4.
The scale factor is 1:4.
First, set up a proportion.
1 gallon/4 quarts=3 gallons/x quarts
Next, cross multiply to solve for x.
1/4-3/x
1x=3x4
Another way to solve the same problem is to use unit analysis.
First, write the unit conversion as a fraction.
One more framing of fractions and their relationship to multiplication and division: dividing by 8 is the same as multiplying by. Multiplying by is the same as dividing by 2. Multiplication and division are thus essentially the same, only having to flip the number or fraction upside-down into its reciprocal.
Use the quadratic equation to find x
x= -.0024, .00139
.001-.0024 is negative, which can't happen in real life so we know x actually equals .00139
In spherical geometry, all points are points on the surface of a sphere. A line is a circle on the sphere whose diameter is equal to the diameter of the sphere. A plane is the surface of the sphere. In spherical geometry, is it possible that two triangles are similar but not congruent? Explain your reasoning.
Answer: It is not possible that two triangles that are similar and not congruent in spherical geometry.
Step-by-step explanation:
For instance, taking a circle on the sphere whose diameter is equal to the diameter of the sphere and inside is an equilateral triangle, because the sphere is perfect, if we draw a circle (longitudinal or latitudinal lines) to form a circle encompassing an equally shaped triangle at different points of the sphere will definately yield equal size.
in other words, triangles formed in a sphere must be congruent and also similar meaning having the same shape and must definately have the same size.
Therefore, it is not possible for two triangles in a sphere that are similar but not congruent.
Two triangles in sphere that are similar must be congruent.
Ami decided to score an average of 90 marks in the four subjects - Maths, Physics, Chemistry and Biology. The maximum marks in each paper was 100. She scored 75 in Maths and 95 in Physics. Which of these, if she scores, will ensure that she gets the desired average score?
To get an average score of 90 in four subjects, Ami needs to score a combined total of 190 marks in Chemistry and Biology after having scored 75 in Maths and 95 in Physics.
Explanation:Ami is aiming to achieve an average score of 90 across four subjects, with each subject having a maximum score of 100 marks. To determine the scores that she needs to achieve in Chemistry and Biology (the remaining two subjects), we begin by calculating the total marks she requires for the desired average.
Since the desired average is 90, for four subjects, the total marks needed would be: 90 marks/subject × 4 subjects = 360 marks.
Ami scored 75 in Maths and 95 in Physics, which sums up to: 75 + 95 = 170 marks.
To find out the remaining marks she needs, we subtract the marks she has already scored from the total marks needed for the average:
360 marks (total needed) - 170 marks (already scored) = 190 marks (needed for Chemistry and Biology).
Therefore, to ensure that she gets the desired average score of 90, she would need to score a combined total of 190 marks in Chemistry and Biology. This could be achieved by, for example, scoring 95 in both subjects or any other combination that adds up to 190.
During an auto accident, the vehicle's air bags deploy and slow down the passengers more gently than if they had hit the windshield or steering wheel. According to safety standards, the bags produce a maximum acceleration of 60g, but lasting for only 36 ms (or less).
solution:
maximum acceleration produce by bag =60 g
time to come to stop = 36 ms
applying equation
[tex]V=u-at[/tex]
inserting values
[tex]0=u-(60)(36*10^-^3)[/tex]
[tex]u=(600*36)/1000=21.6 m/s\\[/tex]
now to find distance of penctration:
[tex]S=ut-1/2at^2[/tex]
inserting values
[tex]S= (21.6)(36*10^-^3)-1/2(600)(0.036)^2[/tex]
[tex]S=0.38m[/tex]
hence distance traveled by person before coming to rest is 0.38 m
PLZ HURRY IT'S URGENT!!
Which equation can be used to find the two numbers whose ratio is 3 to 4 and that have a sum of 35?
3x + 4x = 35
43x=35
34x=35
4x−3x=35
Answer:
3x+4x=35
Step-by-step explanation:
Answer:3x+4x=35
Step-by-step explanation:took the test and got it right
Water is leaking out of a large barrel at a rate proportional to the square rooot of the depth of the water at that time. If the water level starts at 36 inches and drops to 34 inches in 1 hour. How long will it take for all of the water to drain out of that barrel?
Answer:
It will take about 35.49 hours for the water to leak out of the barrel.
Step-by-step explanation:
Let [tex]y(t)[/tex] be the depth of water in the barrel at time [tex]t[/tex], where [tex]y[/tex] is measured in inches and [tex]t[/tex] in hours.
We know that water is leaking out of a large barrel at a rate proportional to the square root of the depth of the water at that time. We then have that
[tex]\frac{dy}{dt}=-k\sqrt{y}[/tex]
where [tex]k[/tex] is a constant of proportionality.
Separation of variables is a common method for solving differential equations. To solve the above differential equation you must:
Multiply by [tex]\frac{1}{\sqrt{y}}[/tex]
[tex]\frac{1}{\sqrt{y}}\frac{dy}{dt}=-k[/tex]
Multiply by [tex]dt[/tex]
[tex]\frac{1}{\sqrt{y}}\cdot dy=-k\cdot dt[/tex]
Take integral
[tex]\int \frac{1}{\sqrt{y}}\cdot dy=\int-k\cdot dt[/tex]
Integrate
[tex]2\sqrt{y}=-kt+C[/tex]
Isolate [tex]y[/tex]
[tex]y(t)=(\frac{C}{2} -\frac{k}{2}t)^2[/tex]
We know that the water level starts at 36, this means [tex]y(0)=36[/tex]. We use this information to find the value of [tex]C[/tex].
[tex]36=(\frac{C}{2} -\frac{k}{2}(0))^2\\C=12[/tex]
[tex]y(t)=(\frac{12}{2} -\frac{k}{2}t)^2\\\\y(t)=(6 -\frac{k}{2}t)^2[/tex]
At t = 1, y = 34
[tex]34=(6 -\frac{k}{2}(1))^2\\k=12-2\sqrt{34}[/tex]
So our formula for the depth of water in the barrel is
[tex]y(t)=(6 -\frac{12-2\sqrt{34}}{2}t)^2\\\\y(t)=\left(6-\left(6-\sqrt{34}\right)t\right)^2\\[/tex]
To find the time, [tex]t[/tex], at which all the water leaks out of the barrel, we solve the equation
[tex]\left(6-\left(6-\sqrt{34}\right)t\right)^2=0\\\\t=3\left(6+\sqrt{34}\right)\approx 35.49[/tex]
Thus, it will take about 35.49 hours for the water to leak out of the barrel.
The time it will take for all of the water to drain out of that barrel is 35.5 hours approx.
What is directly proportional and inversely proportional relationship?Let there are two variables p and q
Then, p and q are said to be directly proportional to each other if
[tex]p = kq[/tex]
where k is some constant number called constant of proportionality.
This directly proportional relationship between p and q is written as
[tex]p \propto q[/tex] where that middle sign is the sign of proportionality.
In a directly proportional relationship, increasing one variable will increase another.
Now let m and n are two variables.
Then m and n are said to be inversely proportional to each other if
[tex]m = \dfrac{c}{n} \\\\ \text{or} \\\\ n = \dfrac{c}{m}[/tex]
(both are equal)
where c is a constant number called constant of proportionality.
This inversely proportional relationship is denoted by
[tex]m \propto \dfrac{1}{n} \\\\ \text{or} \\\\n \propto \dfrac{1}{m}[/tex]
As visible, increasing one variable will decrease the other variable if both are inversely proportional.
For the considered case, let we take three variables as:
t = time passed since start (in hours)[tex]x[/tex] = depth of water at time 't'[tex]y[/tex] = amount of water(in terms of depth) leaking per hour, in litersNow, when t = 0, x = 36 inches.
and at t = 1, x = 34 inches.
So depth of water is function of time passed. Let x = f(t)
Also, y is negative rate of change of x with respect to t(since depth is decreasing, and draining is measuring decrement rate, thus, negative of increment rate), or
[tex]y = -\dfrac{dx}{dt}[/tex]
We're given that: "Water is leaking out of a large barrel at a rate proportional to the square root of the depth of the water at that time"
That means, [tex]y \propto \sqrt{x}[/tex]
Let the constant of proportionality be k, then,
[tex]y = \sqrt{x}[/tex]
Since we've [tex]y = -\dfrac{dx}{dt}[/tex], therefore,
[tex]-\dfrac{dx}{dt} = k\sqrt{x}\\\\-\dfrac{dx}{\sqrt{x}} = kdt\\\\\text{Integrating both the sides, we get}\\\\\int -\dfrac{dx}{\sqrt{x}} = \int kdt\\\\-2\sqrt{x} = kt + C[/tex]
where C is integration constant.
Since at t = 0 hours passed, x = 36 inches, and at t = 1 hour passed, x = 34 inches, we get two equations as:
[tex]-2\sqrt{x} = kt + C\\-2\sqrt{36} = -12 = C\\-2\sqrt{34} = k + C[/tex]
Putting value of C from first equation in second, we get:
[tex]k = -2\sqrt{34} + C \\k = -2\sqrt{34} - 12[/tex]
Therefore, the relationship between depth of water and time we get is:
[tex]-2\sqrt{x} = (-2\sqrt{34} - 12)t -12\\\sqrt{x} = (\sqrt{34} - 6)t + 6[/tex]
When the whole barrel gets empty, the depth of water becomes 0. The time for it is calculated using above equation as:
[tex]\sqrt{x} = (\sqrt{34} - 6)t + 6\\0 = (\sqrt{34} - 6)t + 6\\t = \dfrac{6}{6 - \sqrt{34}} \approx 35.5[/tex](in hours)
Thus, the time it will take for all of the water to drain out of that barrel is 35.5 hours approx.
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Evan wants to build a concrete patio that will be 8 yards by 12 yards. It will cost $0.95 per square yard to build. What will be the total cost of the patio?
To calculate the total cost of the patio, multiply the area of the patio (96 square yards) by the cost per square yard ($0.95), resulting in a total cost of $91.20.
Explanation:To find the total cost of the concrete patio that Evan wants to build, we need to calculate the total area of the patio first and then multiply this area by the cost per square yard.
First, the area of the patio is calculated by multiplying the length by the width:
Area = Length × WidthArea = 8 yards × 12 yardsArea = 96 square yardsThen, we determine the total cost by multiplying the area by the cost per square yard:
Total Cost = Area × Cost per square yardTotal Cost = 96 square yards × $0.95 per square yardTotal Cost = $91.20Therefore, the total cost to build the patio will be $91.20.
The number of people estimated to vote in an election was 7,000. The actual number of people who voted was 5,600
Answer:
A. 25% high
B. 12.5% decrease
Step-by-step explanation:
A. The estimate relative to the actual turnout was ...
7000/5600 = 1.25
The estimate was 25% high.
__
B. Relative to the previous election, the turnout was ...
5600/6400 = 0.875 = 1 - 0.125
The percentage decrease from the previous election was 12.5%.
Maria is trying to decide which one of two winter coat she should but the bluecoat usually cost $48 but it's on sale for 25% off the black coat is really cost $56 but it's on sale for 40% off how much less is the sale price of a black coat in the sale price of a bluecoat
The sale price of a black coat is $ 2.4 less than sale price of a blue coat
Solution:
Given that,
Bluecoat usually cost $48 but it's on sale for 25% off
Cost price of blue coat = $ 48
Discount = 25 %
Therefore, discount price is given as:
Discount price = 25 % of 48
[tex]Discount\ price = 25 \% \times 48\\\\Discount\ price = \frac{25}{100} \times 48\\\\Discount\ price = 0.25 \times 48\\\\Discount\ price =12[/tex]
Thus sales price is given as:
Sales price = cost price - discount price
Sales price = 48 - 12
Sales price = 36
Thus sales price of blue coat is $ 36
Black coat is really cost $56 but it's on sale for 40%
Cost price of black coat = $ 56
Discount = 40 %
Therefore, discount price is given as:
Discount price = 40 % of 56
[tex]Discount\ price = 40 \% \times 56\\\\Discount\ price = \frac{40}{100} \times 56\\\\Discount\ price = 0.4 \times 56\\\\Discount\ price =22.4[/tex]
Thus sales price is given as:
Sales price = cost price - discount price
Sales price = 56 - 22.4
Sales price = 33.6
Thus sales price of black coat is $ 33.6
How much less is the sale price of a black coat in the sale price of a blue coat
Sales price of blue coat - sales price of black coat = 36 - 33.6 = 2.4
Thus sale price of a black coat is $ 2.4 less than sale price of a blue coat
Answer:
2.40
Step-by-step explanation:
At 8am the temperature was 3 degrees below zero by 1 am the temperature rose 14 degrees and by 10 pm dropped 12 degrees what was the temperature at 10 pm
The temperature at 10 pm was -1 degree.
Explanation:To find the temperature at 10 pm, we need to start with the temperature at 8am. Since the temperature was 3 degrees below zero at 8 am, we can add the rise of 14 degrees by 1 am to get the temperature at 1 am. Then, we need to subtract the 12 degree drop by 10 pm to find the temperature at that time.
Starting with 8 am: -3 degrees
Add 14 degrees: -3 + 14 = 11 degrees at 1 am
Subtract 12 degrees: 11 - 12 = -1 degree at 10 pm
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To borrow money, you pawn your guitar. Based on the value of the guitar, the pawnbroker loans you $960. One month later, you get the guitar back by paying the pawnbroker $1170. What annual interest rate did you pay?
Based on the simple interest formula, the annual interest rate paid when borrowing $960 and repaying $1170 a month later is approximately 262.5%.
Explanation:This problem can be solved by using the formula for calculating simple interest, which is Interest = Principal (P) * Rate (R) * Time (T). In this case, the difference between what you paid and what you borrowed, $1170 - $960 = $210, is the interest you paid. Therefore, we can use the given information to set up the equation 210 = 960 * R * (1/12), because the time period T is 1 month, or 1/12 of a year. By solving this equation, we find that the annual interest rate is approximately 262.5%.
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Mulder and Scully are driving to the same town. Mulder leaves the office at 9:30a.m. averaging 57mph. Scully leaves at 10:00a.m., following the same path and averaging 60 mph. At what time will Scully catch up with Mulder?
Answer:
Scully will catch up with Mulder by 7:30 PM.
Step-by-step explanation:
Consider the provided information.
Mulder leaves the office at 9:30a.m. averaging 57mph.
Scully leaves at 10:00a.m., following the same path and averaging 60 mph.
Distance covered by Mulder between 9:30 AM and 10:00 AM:
[tex]\frac{57}{2}= 28.5[/tex] miles
Let t is the time taken by Scully to catch up with Mulder.
After leaving office Scully needs to cover extra distance of 28.5 miles because Mulder leaves the office earlier.
Therefore total distance cover by them is:
[tex]28.5+57t=60t[/tex]
[tex]28.5=60t-57t[/tex]
[tex]28.5=3t\\t=9.5[/tex]
Hence, it would take 9 hours 30 minutes to catch up Mulder.
10 am + 9 hours 30 minutes = 7:30 pm
Therefore, Scully will catch up with Mulder by 7:30 PM.
Final answer:
Scully will catch up with Mulder at 7:30 p.m. by closing the initial 28.5 miles gap at a rate of 3 mph faster than Mulder.
Explanation:
To determine when Scully will catch up with Mulder, we need to calculate the relative speeds at which the two are traveling and how long it will take for Scully to close the gap that Mulder has created by leaving earlier. Since Mulder left at 9:30 a.m. and Scully left at 10:00 a.m., Mulder has a half-hour head start. In that half-hour, traveling at 57 mph, Mulder will have covered 28.5 miles (because 0.5 hours × 57 mph = 28.5 miles).
Scully is traveling at 60 mph, which is 3 mph faster than Mulder. So, Scully closes the gap by 3 miles every hour. To catch up 28.5 miles at a rate of 3 miles per hour, Scully will need 9.5 hours (because 28.5 miles ÷ 3 mph = 9.5 hours).
We need to add this time to Scully's departure time to find out when she will catch up. Therefore, adding 9.5 hours to 10:00 a.m. yields 7:30 p.m. So, Scully will catch up with Mulder at 7:30 p.m.
A factory has three machines, A, B, and C, for producing items. Machine A makes 60% of all the widgets, and machine B makes the rest. 3% of machine A’s widgets are defective, and 8% of machine B’s widgets are defective. One of the factory’s widgets is found to be defective; what is the probability that it was made by machine?
Amy invests money in two simple interest accounts. She invests four times as much in an account paying 11% as she does in an account paying 5%. If she earns $183.75 in interest in one year from both accounts combined, how much did she invest altogether?
Answer: Total amount invested in both accounts is $1875
Step-by-step explanation:
Let x represent the amount invested at 11%.
Let y represent the amount invested at 5%.
She invests four times as much in an account paying 11% as she does in an account paying 5%. This means that
x = 4y
The formula for determining simple interest is expressed as
I = PRT/100
Where
P represents the principal
R represents the rate of investment
T represents the time in years.
Considering the amount invested at 11%,
I = (x × 11 × 1)/100 = 0.11x
Considering the amount invested at 5%,
I = (y × 5 × 1)/100 = 0.05y
If she earns $183.75 in interest in one year from both accounts combined, it means that
0.11x + 0.05y = 183.75 - - - - - - - - - -1
Substituting x = 4y into equation 1, it becomes
0.11 × 4y + 0.05y = 183.75
0.44y + 0.05y = 183.75
0.49y = 183.75
y = 183.75/0.49
y = 375
x = 4y = 375 × 4
x = 1500
Total amount invested in both accounts is
1500 + 375 = $1875
Amy invested a total of $1875 in both simple interest accounts. She placed $375 into the account with a 5% interest rate and $1500 into the account with an 11% interest rate to achieve the total interest income of $183.75 in one year.
Explanation:Amy invests money in two simple interest accounts. One account pays 11% interest, while the other pays 5%. If she puts four times as much into the 11% account as the 5% account, we can set up the following equations to find out how much she invested altogether:
Let x represent the amount invested at 5%.Then 4x will represent the amount invested at 11%.The total interest from both accounts is $183.75 for one year.We can use the formula for simple interest which is Interest = Principal × Rate × Time, where the principal is the initial amount of money invested, the rate is the interest rate, and the time is the period of time over which the money is invested.
So, the total interest earned from both accounts is:
Interest from 5% account + Interest from 11% account = $183.75
(x × 0.05 × 1) + (4x × 0.11 × 1) = $183.75
0.05x + 0.44x = $183.75
0.49x = $183.75
Now, solve for x:
0.49x = $183.75
x = $183.75 / 0.49
x = $375
Since x represents the amount invested at 5%, Amy invested $375 in the 5% account. To find the total investment:
Total investment = x + 4x
Total investment = $375 + 4(×$375)
Total investment = $375 + $1500
Total investment = $1875
Mrs. Conley asks her class what kind of party they want to have to celebrate their excellent behavior. Out of all the students in the class, 5 want an ice cream party, 7 want a movie party, 10 want a costume party, and the rest are undecided. If 20 percent want an ice cream party, how many students are in the class?a. 23
b. 200
c. 5d. 25
Answer: d. 25
Step-by-step explanation:
Let x be the total number of students in the class.
As per given :
Number of students want ice cream party = 20% of x= 0.20x
[we divide percent by 100 to convert it into decimal.]
Actual number of students want ice cream party =5
⇒ 0.20x=5
Divide both sides by 0.20 , we get
⇒ x= [tex]\dfrac{5}{0.20}=\dfrac{500}{20}=25[/tex]
Hence, the total number of students in the class.= 25
Thus , the correct answer is d. 25
Mary had a link of yarn 4 1/3 inches long she cut it into two pieces for her art project one of the pieces was 2 1/2 inches long what was the length of the second piece inches
Answer: the length of the second piece is 1 5/6 inches
Step-by-step explanation:
Mary had a link of yarn 4 1/3 inches. Converting 4 1/3 inches to improper fraction, it becomes 13/3 inches.
She cut it into two pieces for her art project. One of the pieces was 2 1/2 inches long. Converting 2 1/2 inches to improper fraction, it becomes 5/2 inches.
Therefore, the length of the second piece would be
13/3 - 5/2 = (26 - 15)/6 = 11/6 inches.
Converting to mixed fraction, it becomes
1 5/6 inches
Decide which food truck you would like to purchase (the blue or green food truck) and determine what the total cost will it be to make it fully functional. A local business has decided to donate 3 times as much money we you have saved in order to purchase the food truck. What is the minimum amount you need to save in order to purchase the food truck?
To find out the minimum amount you need to save to buy the food truck (assuming a local business will donate three times your savings), divide the total cost of the truck by four. This is because the saved amount plus the donated amount (which is three times your savings) should be enough to cover the full cost of the truck.
Explanation:The question is asking for the minimum amount that you need to save in order to buy a food truck, assuming a local business will donate 3 times the amount you have saved. To efficiently and accurately calculate this, it's best to start from the total cost of the truck and work backwards.
Firstly, let’s consider the cost to make the food truck fully functional as X (it's not specified whether it's the blue or green food truck). According to the information, the amount saved will be your contribution, and the local business will donate 3 times your saved amount. This means that the total money available to purchase the food truck will be 4 times the saved amount (the saved amount plus the three times donation).
To find out the minimum amount you need to save, we can use the formula:
minimum savings = total cost / 4
This equation shows that the minimum savings needed will be one-fourth of the total cost of the food truck.
Learn more about Savings for Purchase here:https://brainly.com/question/30107624
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Converges or Diverges: Please help
The equation after the sum symbol is written in terms of ar^k-1
A = 12 and r = 0.7
To see if it converges use the formula a /1-r, if the answer is greater than 1 it converges, if it’s less than 1 it diverges
12 / 1 - 0.7 = 12/0.3 = 40
The answer C. Converges, 40
A spring requires 12 J12 J to stretch the spring from 8 cm8 cm to 10 cm10 cm, and an additional 48 J48 J to stretch the spring from 10 cm10 cm to 14 cm14 cm. What is the natural (unstressed) length of the spring?
Answer:
6cm
Step-by-step explanation:
Given
12J to stretch from 8cm to 10cm ---- Expression 1
Additional 48J from 10cm to 14cm ---- Expression 2
Let l represents the length of the spring
Let k represent string constant,
We can then write ( from expression 1)
12 = integral of kx dx
The lower bound being 8 - l
And the upper bound being 10 - l
Integrating kx dx
We have
½kx²
= ½k[x²]
= ½k[(10 - l)² - (8 - l)²].
So, 12 = ½k[(10 - l)² - (8 - l)²] ------ Equation 1
From expression 2, we can write
48 = integral of kx dx
The lower bound being 10 - l
And the upper bound being 14 - l
Integrating kx dx
We have
½kx²
= ½k[x²]
= ½k[(14 - l)² - (10 - l)²].
So, 48 = ½k[(14 - l)² - (10 - l)²] ------ Equation 2
Divide Equation 2 by Equation 1, so we get
48/12 = ½k[(14 - l)² - (10 - l)²] / ½k[(10 - l)² - (8 - l)²] ----- ½k cancel out ½k
So, w have
4 = [(14 - l)² - (10 - l)²] / [(10 - l)² - (8 - l)²]
Recall that a² - b² = (a + b)(a - b).
So,
4 = [(14 - l - 10 + l) (14 - l + 10 - l)] / [(10 - l - 8 + l) (10 - l + 8 - l)]
4 = [(4)(24 - 2l)]/[(2)(18-2l)]
4 = (96 - 8l)/36 - 4l) ---- Multiply both sides by 36 - 4l
4(36 - 4l) = 96 - 8l
144 - 16l = 96 - 8l ----- Collect Like Terms
144 - 96 = 16 - 8l
48 = 8l ----- Divide both sides by l
48/8 = l
6 = l --- Rearrange
l = 6
So, the natural length of the string is 6cm
A poll is to be conducted a few weeks before a state election to determine which of two candidates running for governor has greater support. The polling organization will randomly select 500 registered voters in the state to poll. It will record each person's response in a variable called "Preference," with possible values of Candidate A, Candidate B, Other). What is the population of interest? the 500 registered voters all residents of the state all registered voters who support Candidate A all registered voters in the state Candidate A, Candidate B, and Other
Answer:
The population of interest is all the residents of the state.
Step-by-step explanation:
The term 'population of interest' is defined as the population under study from which the sample is drawn to make conclusions about the said population.
For instance, if a school principal wants to know the average SAT score for the students of his school, then his population of interest will be all the students of the school.
In this scenario a poll is conducted to determine which candidate, running for the governor's seat, has more support.
The sample of 500 registered voters are selected from the state for the poll.
This implies that the population under study consists of all the people of the state.
Thus, the population of interest in this case are all the residents of the state.
The correct option is: all the residents of the state.
Converges or Diverges: Please help me
Use a/ 1-r
Where a = 18 and r = 1.2
18/ 1 - 1.2 = 18/-.2 = -90
Because the answer is below 1. The sum does not exist therefore it diverges.
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A truck that can carry no more than 5900 lb is being used to transport refrigerators and upright pianos. Each refrigerator weighs 200 lb and each piano weighs 525 lb. Write and graph an inequality to show how many refrigerators and how many pianos the truck could carry. Will 13 refrigerators and 8 pianos overload the truck?
Answer:
the truck will over load with 13 refrigerators and 8 pianos
Step-by-step explanation:
13 refrigerators is 2600 lbs
8 pianos is 4200 lbs
both added together is 6800 lbs
the truck can only hold 5900 so 13 refrigerators and 8 pianos is too heavy
Answer:
200r +525p ≤ 5900see below for a graphyes, the truck would be overloadedStep-by-step explanation:
The weight of r refrigerators is 200r. The weight of p pianos is 525p. The total weight must not exceed 5900 lb. So, the total weight of r refrigerators and p pianos must satisfy ...
200r +525p ≤ 5900
In addition, we cannot have negative refrigerators or pianos, so we must also have ...
r ≥ 0
p ≥ 0
A graph is attached.
_____
The point (r, p) = (13, 8) is not in the solution space. 13 refrigerators and 8 pianos would overload the truck.