Y=2x-7, 3x-2=9 solving systems

Answer:

Step-by-step explanation:

The formula for determining the total surface area of a cylinder is expressed as

Total surface area = 2πr² + 2πrh

Where

r represents the radius of the cylinder.

h represents the height of the cylinder.

π is a constant whose value is 3.14

Assuming that the cylindrical cup is open at the top, the formula becomes

Area = πr² + 2πrh

From the information given,

Radius = 1.8 inches

Height = 4 inches

Therefore, the surface area of the coffee cup is

(3.14 × 1.8²) + (2 × 3.14 × 1.8 × 4)

= 10.1736 + 45.216

= 55.4 inches² to the nearest tenth.

Answer:

55.4 :))

Step-by-step explanation:

Answer:

[tex] P(X>45 | X>40)= \frac{P(X>45 \cap X>40)}{P(X>40)}= \frac{P(X>45)}{P(X>40)}= \frac{0.113}{0.343}= 0.329[/tex]

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the age of a population, and for this case we know the distribution for X is given by:

[tex]X \sim N(37.5,6.2)[/tex]  

Where [tex]\mu=37.5[/tex] and [tex]\sigma=6.2[/tex]

We are interested on this probability:

[tex] P(X>45 | X>40)= \frac{P(X>45 \cap X>40)}{P(X>40)}= \frac{P(X>45)}{P(X>40)}[/tex]

We can begin finding [tex] P(X>40)[/tex] using the z score formula given by:

[tex] z = \frac{a-\mu}{\sigma}[/tex]

Using this formula we have:

[tex] P(X>40)= P(Z>\frac{40-37.5}{6.2}) = P(Z>0.403)[/tex]

And using the complement rule and the normal standard table or excel we have this:

[tex]P(Z>0.403)=1-P(Z<0.403)= 1-0.657= 0.343[/tex]

Now we can find [tex] P(X>45)[/tex] using the z score formula given by:

[tex] z = \frac{a-\mu}{\sigma}[/tex]

Using this formula we have:

[tex] P(X>45)= P(Z>\frac{45-37.5}{6.2}) = P(Z>1.210)[/tex]

And using the complement rule and the normal standard table or excel we have this:

[tex]P(Z>1.210)=1-P(Z<1.210)= 1-0.887= 0.113[/tex]

And replacing into our original probability we got:

[tex] P(X>45 | X>40)= \frac{P(X>45 \cap X>40)}{P(X>40)}= \frac{P(X>45)}{P(X>40)}= \frac{0.113}{0.343}= 0.329[/tex]

The area would be 8 2/3* 5 3/4 which according to my calculator is 49 5/6

So the area is 49 5/6 ft^2.

Hope this helped!

Answer:

The correct answer is C. 30 = 9x + 7

Correct statement and question:

Elena is cutting a 30-foot piece of ribbon for a craft project. She cuts off 7 feet, and then cuts the remaining piece into 9 equal lengths of x feet each.

Answer choices:

A. 7x + 9 = 30

B. 30x + 7 = 9

C. 30 = 9x + 7

D. 9x - 7 = 30

Source:

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Step-by-step explanation:

1. Information given to us to answer the problem correctly:

Length of the piece of ribbon for a craft project = 30 feet

First cut = 7 feet

Remaining piece cut into 9 equal lengths of x feet each

2. Let's find the right equation to solve for x:

9x + 7 = 30

The nine equal pieces of x feet each plus the piece of 7 feet add up to 30 feet

The correct answer is C. 30 = 9x + 7

Answer:

44.4%

Step-by-step explanation:

Additional amount they were adding to equipment cost is $900

Percentage of $900 that is $400 = $400/$900 × 100 = 44.4%

$400 is approximately 44.44% of the additional $900 being added to the equipment cost.

To calculate what percent $400 is out of the additional $900 being added to the equipment cost, we can use the following formula:

In this case, the part is $400, which is the predicted additional profit from advertising, and the whole is the total additional amount of $900 being added to the equipment cost.

Using the formula:

So, $400 is 44.44% (approximately) of the additional $900 that the brothers were planning to add to the equipment cost.

Yo sup??

y=-3/x+4

cross multiply

x+4=-3/y

x=-3/y-4

f(y)=-3/y-4

or

f(x)=-3/x-4

=-4x-3/x

The correct answer is option 4

Hope this helps.

The question is incomplete. The map is attached as a photo and here is the complete question:

a. What is the actual distance between Saugerties and

Kingston? ___________________________

b. Catskill is 15 miles from Saugerties. What would the

distance on the map be? ___________________________

c. On another map, the distance between Saugerties and

Kingston is 2 inches. What would the distance from Saugerties to

Catskill be on this map? __________________

Since you have asked the answer for part (c) only, here is the answer:

Answer:

The distance from Saugerties to Catskill would be 3 inches on this map.

Step-by-step explanation:

On the given map, the distance between Saugerties and Kingston is 4 inches and the scale is 1 inch = 2.5 miles.

To calculate the actual distance in miles between Saugerties and Kingston, consider the given scale:

1 inch ---------- 2.5 miles

4 inches ------ x miles

Cross multiplying:

1x = 2.5 x 4

x = 10 miles

The actual distance between Saugerties and Kingston is 10 miles.

On another map, the distance between Saugerties and Kingston is 2 inches. Which means the scale is 2 inches = 10 miles. So 1 inch = 10/2 = 5 miles

The scale on the other map is 1 inch = 5 miles.

Catskill is 15 miles from Saugerties (given in the previous part). So on the map:

1 inch -------- 5 miles

y inch ------- 15 miles

Cross multiplying:

15 = 5y

y = 15/5

y = 3 inches.

The distance from Saugerties to Catskill would be 3 inches on this map.

Answer: d

Step-by-step explanation: Both country A and B has equal number of workers,physical capital, human capital and access to natural resources.

Non is higher than the other.

Since a silicon (Φ = 7.77 × 10-19 J) surface is irradiated with UV radiation with a wavelength of 235 nm. Assume an electron was a mass of 9.11 x 10-31 kg, the kinetic energy of the emitted electrons is 6.9 × 10⁻²⁰ J

The kinetic energy of emitted electron in photoelectric effect is given by

K = hc/λ - Φ where

Since a silicon (Φ = 7.77 × 10-19 J) surface is irradiated with UV radiation with a wavelength of 235 nm. Assume an electron was a mass of 9.11 x 10-31 kg. To determine the kinetic energy of the emitted electrons, we proceed as follows

Since the kinetic energy of the emitted electrons is

K = hc/λ - Φ

Given that

So, substituting the values of the variables into the equation, we have that

K = hc/λ - Φ

K = (6.63 × 10⁻³⁴ Js × 3 × 10⁸ m/s)/235 × 10⁻⁹ m - 7.77 × 10⁻¹⁹ J

K = (19.89 × 10⁻²⁶ Jm)/235 × 10⁻⁹ m - 7.77 × 10⁻¹⁹ J

K = 0.0846 × 10⁻¹⁷ J - 7.77 × 10⁻¹⁹ J

K = 8.46 × 10⁻¹⁹ J - 7.77 × 10⁻¹⁹ J

K = 0.69 × 10⁻¹⁹ J

K = 6.9 × 10⁻²⁰ J

So, the kinetic energy is K = 6.9 × 10⁻²⁰ J

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n = the number of miles traveled

0.75n + 1.75 ≤ 20     Option D

[costs $0.75 for each additional mile (n) plus $1.75 for the first mile less than or equal to $20 (because you have a maximum of $20 and you can't spend more than that)]

The inequality to determine the number of additional miles you can travel with $20, considering a base fare of $1.75 and $0.75 per additional mile, is 0.75n + 1.75 ≤ 20.

The subject of this question is to determine which inequality represents the situation of a taxi cab fare and how many miles can be traveled with $20 given the cost per mile. The correct inequality is the one that starts with the base fare and adds the cost for each additional mile multiplied by the number of miles. The base fare is $1.75 for the first mile and there is an additional cost of $0.75 for each additional mile.

Let n represent the number of additional miles you can travel. Since you have $20, the inequality to find out how many miles you can travel would be the money spent on additional miles plus the base fare has to be less than or equal to $20 you have. This is represented by the inequality 0.75n + 1.75 ≤ 20. This means we are adding $0.75 for each additional mile (n) to the base fare of $1.75, and the total cost must not exceed $20 to stay within the budget.

Answer:

d

Step-by-step explanation:

The probability of computers are 20%. Therefore to determine the amount that would break out of 10 we simply just multiply by 0.2.

[tex]=10\cdot{0.2}=2[/tex]

Therefore at most two breaks down. The answer is d

Answer:

2038000 visitors

Step-by-step explanation:

Now in question expression has been repeated, so original expression is

[tex]-8.5x^2+103x+2026[/tex]

Now according to given information "x" represent the number of years after 2006. So, for 2018, it will be

2018-2006 = 12 years

So, x = 12

putting value of x in expression

(-8.5)x(12)^2 + (103)x(12) + 2026

-1224 + 1236 + 2026

2038

Now the model shows the number of visitors in thousand, so you have to multiply your answer in thousand

2038 x 1000

= 2038000 visitors

Answer: m= $25/10 r

Step-by-step explanation:

Let m= money

r= raffle ticket

Then according to the statement

m= $25 for 10 tickets

so 10 tickets= $25

Or the equation goes,

m= $25/10 r

Answer: 3/8

Step-by-step explanation:

Firstly, let's look at the possible outcome when 3 coins are tossed.

If two coins are first tossed, the possible outcome will be,

{HH, HT, TH, TT}

if one more coin is tossed together with the two to make it 3coins, the possible outcome will be gotten by matching the H and T of the third coin with the set of sample space above to give us,

S = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}

This gives a total sample space of 8.

Outcomes that has at least two consecutive heads in the sequence are {HHH, HHT, THH} which is the possible outcome i.e 3

Probability that the outcome has at least two consecutive heads in the sequence will be;

Possible outcome/total outcome

= 3/8

Answer:

Absolute magnitude

Step-by-step explanation: Astronomy deals with the study of stars and other heavenly bodies. Astronomers use apparent magnitude to define how bright a star appears and shines from the earth.

Answer:

A=4000, B=80, C=24

Step-by-step explanation:

You forgot to put the correct area model, I attached it to the answer.

We have the fact that Mountain Q is 4 times the height of Mountain P. That's the "4" we have in the left side of our model. It's like having a multiplication table, next to the "4" we have "A" and upper this we have "1000", the only thing we have to do is multiplify 4*1000=4000. The next letter we have is B and below it we have "320", we divided it by 4, 320/4=80. The last letter we have is C, and is below a "6", we only have to multiplify it by 4, 6*4=24.

At the end we only sum our

The missing values in the model for the area are:

A = 4,000

B = 80

C = 24

A model is a mathematical system that represents a real life concept in an easy to understand manner.

Given the model in this question, we can find the missing values as shown below:

A = 4 × 1000 = 4,000

B = 320/4 = 80

C = 4 × 6 = 24

Therefore, the missing values in the model for the area are:

A = 4,000

B = 80

C = 24

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Final answer:

Rosa saves 30% of her weekly earnings for college, which is calculated by dividing the amount saved ($36) by her total weekly earnings ($120) and then multiplying by 100%.

Explanation:

To determine the percentage of her earnings that Rosa saves, we will use the formula for calculating percentage: Percentage saved = (Amount saved ÷ Total earnings) × 100%.

First, we identify the total earnings and the amount saved: Rosa's total weekly earnings are $120, and she saves $36 each week.

Next, we calculate the percentage: Percentage saved = ($36 ÷ $120) × 100% = 0.3 × 100% = 30%.

Therefore, Rosa saves 30% of her weekly earnings for college.

Proof

Provide the missing reasons for the proof of part of the triangle midsegment theorem.

Given: K is the midpoint of MJ.

           L is the midpoint of NJ.

Prove: MN = 2KL

The complete answer is attached in the diagram below.

The complete answer for the missing reasons is attached below in the diagram.

Please check the figure.

Keywords: statement, proof, reason

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Answer:

Probability so see one falling star over half an hour is 0.25

Step-by-step explanation:

An hour can be taken as two half hours so we can write the probability to see a falling star as

(1-P)*(1-P) = 1 - 0.44

( 1 - P )² = 0.56

1 - P = [tex]\sqrt{0.56}[/tex]

P = 1 - [tex]\sqrt{0.56}[/tex]

P = 0.25

Debra's cows produced [tex] 2 \frac{7}{24}[/tex] more gallons than Hank's cows.

Hank's cows :

Debra's Cows :

The difference in amount of Milk produced :

Sum of Debra's cow - Sum of Hank's cows

Now we have:

11⅙ - 8⅞

67/6 - 71/8 = (536 - 426) / 48

67/6 - 71/8 = 110/48

110/48 = [tex] 2 \frac{7}{24}[/tex]

Hence, Debra's cows produced [tex] 2 \frac{7}{24}[/tex] more gallons than Hank's cows.

Answer:

The answer to your question is the probability to select a yogurt of raspberry is 1/4 or 25%.

Step-by-step explanation:

Data

Number of cartons = 12

Number of cartons of raspberry = 3

To solve this problem, just use the formula of probability and simplify it to get the result.

Formula

P(A) = [tex]\frac{Number of favorable outcomes to A}{Total number of outcomes}[/tex]

Substitution

P(A) = 3/12

Simplification

P(A) = 1/4 or 25%

Answer:

20%.

Step-by-step explanation:

I = PRT

300 = 3000*R * 0.5

300 =  1500R

R = 300 / 1500

R =  3/15 = 1/5

As a percentage it is  100 * 1/5

= 20%.

Answer: 20%

Step-by-step explanation: Notice that in this problem we're asked to find the interest rate not the interest so our answer will be a percent rate of interest.

Let's start this problem by writing the interest formula shown below.

Interest = principal · rate · time

Now we fill in the formula.

The interest earned is $300 so we substitute 300 into the formula.

The principal is the amount invested or $3,000.

We don't know the rate so we can use the variable r.

The time is 0.5 which is equivalent to 1/2

so we can substitute 1/2 in for t.

So we have the equation 300 = (3,000)(r)(1/2).

Simplifying on the right side of the equation, 3,000 · 1/2 is 1,500.

So we have 300 = 1,500r

Now to solve for r since r is being multiplied by 1,500, we need to divide by 1,500 on both side of the equation.

On the right side of the equation, the 1,500's cancel and we have r and on the left side of the equation we have 300 divided by 1,500 or 0.2.

This means that 0.2 = r.

Remember however that the interest rate is a percent so we need to change our decimal to a percent by moving the decimal point 2 places to the right to get 20%. So the interest rate is 20%.

Answer: The system of equations required is

x + y = 20

40x + 70y = 1220

Step-by-step explanation:

Let x represent the number of small boxes of paper shipped and

Let y represent the number of large boxes of paper shipped.

A total of 20 boxes of paper were shipped. This is expressed as

x + y = 20

Each small box of paper weighs 40 pounds and each large box of paper weighs 70 pounds. The total weight of the large and small boxes of paper that were shipped is 1220 pounds altogether. This is expressed as

40x + 70y = 1220

We define x as the number of small boxes and y as the number of large boxes. The first equation, x + y = 20, is based on the total number of boxes. The second equation, 40x + 70y = 1220, is based on the total weight of the boxes.

We need to find a system of equations that represents the given situation. We will use two variables. Let's say x represents the number of small boxes and y represents the number of large boxes for your problem.

The first equation can be based on the total number of boxes, which is 20. So, the equation is: x + y = 20.

The second equation will be based on the total weight of the boxes, which is 1220 pounds. A small box weighs 40 pounds and a large box weighs 70 pounds. So, the equation will be: 40x + 70y = 1220.

So, we have the system of equations:

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Answer: Paul is 18 years old and Gary is 12 years old.

Step-by-step explanation:

Let x represent the age of Paul.

Paul is six years older than Gary. This means that Gary's age would be

x - 6

The sum of their ages is 30. This means that

x + x - 6 = 30

2x - 6 = 30

Adding 6 to the left hand side and the right hand side of the equation, it becomes

2x - 6 + 6 = 30 + 6

2x = 36

Dividing the left hand side and the right hand side of the equation by 2, it becomes

2x/2 = 36/2

x = 18

Therefore, Paul is 18 years old.

Gary is 18 - 6 = 12 years old.

Answer:

  78

Step-by-step explanation:

You want to know the sum of two 2-digit numbers such that one differs from the other by a multiple of 10, and the difference of their squares is 2340.

The difference of squares is the product of the sum and difference of the two numbers. Here, the difference must be a multiple of 10, so we want factorizations of 2340 that have a multiple of 10 as a factor. These are ...

  2340 = 10(234) = 20(117) = 30(78)

where the first factor (the difference) is less than the second factor (the sum).

The sum of two 2-digit numbers cannot be more than 200, and it must be even if they both have the same units digit. The only viable product from the above list is 30 × 78, where 30 is the difference of the numbers and 78 is their sum.

The sum of the numbers is 78.

__

Additional comment

The two numbers are 54 and 24. The difference of their squares is ...

  2916 -576 = 2340

Difference of squares: a² -b² = (a -b)(a +b).

Answer:

2.5 pounds pounds of sulfur and 1 pound of lead should be removed each day in order to minimize net cost.

Step-by-step explanation:

Given model of cost:

[tex]C(x, y) = 7,000 + 100x^2 + 50y^2[/tex]

Government clean-air subsidies amount for sulfur = 500 $/pound

Government clean-air subsidies amount for lead = 100 $/pound

Subsidies amount for x pounds of sulfur = x500 $

Subsidies amount for y pounds of lead= y100 $

Model of subsidy amount :

[tex]S(x,y)=500x+100y[/tex]

Net cost(N) = Cost - Subsidy = C(x,y)-S(x,y)

[tex]N=7,000 + 100x^2 + 50y^2-500x-100y[/tex]..[1]

Differentiating above [1] in with respect to dx :

[tex]\frac{dN}{dx}=\frac{7,000 + 100x^2 + 50y^2-500x-100y}{dx}[/tex]

[tex]\frac{dN}{dx}=200x-500[/tex]..[2]

Putting [tex]\frac{dN}{dx}=0[/tex]:

[tex]0=200x-500[/tex]

x = 2.5

Now taking second derivative of [2]:

[tex]\frac{d^N}{dx^2}=200[/tex]

[tex]\frac{d^N}{dx^2}>0[/tex] (minima)

Differentiating above [1] in with respect to dy :

[tex]\frac{dN}{dy}=\frac{7,000 + 100x^2 + 50y^2-500x-100y}{dy}[/tex]

[tex]\frac{dN}{dy}=100y-100[/tex]..[3]

Putting [tex]\frac{dN}{dy}=0[/tex]:

[tex]0=100y-100[/tex]

y = 1

Now taking second derivative of [3]:

[tex]\frac{d^N}{dy^2}=100[/tex]

[tex]\frac{d^N}{dy^2}>0[/tex] (minima)

2.5 pounds pounds of sulfur and 1 pound of lead should be removed each day in order to minimize net cost.

The amounts of sulfur and lead the firm should remove are 2.5 pounds and 1 pound respectively to minimize the net cost.

Given to us

cost of controlling emissions, C(x, y) = 7,000 + 100x² + 50y²

amount to $500 per pound of sulfur

$100 per pound of lead removed

We know that the net cost can be written as,

T(x, y) = 7,000 + 100x² + 50y² -500x -100y

where x and y is the amount of sulfur and lead emission reduced respectively.

To find the minimum of x differentiate the value of net cost with respect to x,

[tex]\dfrac{dT}{dx} = \dfrac{ 7,000 + 100x^2 + 50y^2 -500x -100y}{dx}[/tex]

    [tex]= \dfrac{ 7,000 + 100x^2 + 50y^2 -500x -100y}{dx}\\\\= 0+ 100(2x) + 0 + 500 + 0\\\\ = 200x+500[/tex]

Substitute against 0, to get the minimum value of x,

0 = 200x+500

x = 2.5

Differentiate again,

[tex]\dfrac{d^2T}{dx^2} = \dfrac{d(200x+500)}{dx}[/tex]

      [tex]=200+0[/tex]

As the value of differentiation is positive, therefore, the slope of the function will be going towards the positive.

To find the minimum of y differentiate the net cost with respect to y,

[tex]\dfrac{dT}{dy} = \dfrac{ 7,000 + 100x^2 + 50y^2 -500x -100y}{dy}[/tex]

     [tex]= 0+0+50(2y)-100\\\\=100y-100\\\\=100(y-1)[/tex]

Substitute against 0 to get the minimum value of y,

0 = 100(y-1)

y = 1

Differentiate again,

[tex]\dfrac{d^2T}{dy^2} = \dfrac{d(100y-100)}{dy}[/tex]

       [tex]=100[/tex]

As the value of differentiation is positive, therefore, the slope of the function will be going towards the positive.

Hence, the amount of sulfur and lead the firm should remove is 2.5 pounds and 1 pound respectively to minimize the net cost.

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The average rate of change for the function over the interval 1 ≤ x ≤ 3 is 2.

The average rate of change for a function can be calculated by finding the difference in the function values over the given interval and dividing it by the difference in the x-values over the same interval.

For the given function graphed, the average rate of change over the interval 1 ≤ x ≤ 3 is calculated as follows:
Average rate of change = (f(3) - f(1)) / (3 - 1)

By evaluating the function at x = 1 and x = 3 and applying the formula, we find:
Average rate of change = (6 - 2) / 2 = 4 / 2 = 2

Therefore, the BEST estimate of the average rate of change for the function over the interval 1 ≤ x ≤ 3 is 2 (option A).

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Answer:

option B

Step-by-step explanation:

The described data is qualitative because regions of a residence has categories and it don't measure or count anything. The regions of residence can be divided into different categories and numerical quantities can be assigned to them but still they will be qualitative variables because numerical quantities will be working as identifiers and they don't measure or count anything.

Answer:

one penny = S

one nickel = T

one dime = U

one quater = V

∴ Probability one obtaining at least one of S, T, U or V = 4/24 = 1/6

Step-by-step explanation: They can be arranged as follows

1) STUV    

2)TSUV

3) TSVU

4) UVST

5) VUST

6) VUTS

7) TVUS

8) TVSU

9) TUVS

10) SVUT

11) VSTU

12) VSUT

13) SVTU

14) UTSV

15) UTVS

16) USTV

17) USVT

18) VTUS

19) VTSU

20) SUTV

21) SUVT

22) STVU

23) TUSV

24) UVTS

Answer:

Step-by-step explanation:

A yard of lace costs w cents a yard and fabric costs $.40 more than the lace. This means that the cost of a yard of fabric would be

w + 0.5

Kimberly wants to buy one yard of lace and 2 yards of fabric. This means that the total amount of money that she would have to pay for the lace is is

0.4 × 1 = 0.40

Amount that she would spend on the fabric is 2(w + 0.5) = 2w + 1

Total cost would be

0.4 + 2w + 1

Final answer:

Kimberly will need a total of 3w + 80 cents to purchase one yard of lace and two yards of fabric, where w is the cost of one yard of lace in cents.

Explanation:

To calculate how much money Kimberly will need to buy one yard of lace and two yards of fabric, first we identify the cost of one yard of lace as w cents. The fabric costs $0.40 more than the lace per yard, so the cost of one yard of fabric is w cents + 40 cents. Kimberly wants to buy two yards of fabric, so we multiply the cost of one yard of fabric by 2, which gives us 2(w + 40) cents.

Adding together the cost of the lace and the two yards of fabric, we get: w + 2(w + 40). Simplifying this expression, we have: w (cost of one yard of lace) + 2w (twice the cost of lace per yard for two yards of fabric) + 80 (twice the additional cost of fabric per yard)

w + 2w + 80 cents

3w + 80 cents

Therefore, Kimberly will need a total of 3w + 80 cents to purchase one yard of lace and two yards of fabric.