600 units of electricity and 100 units of gas were used for a total cost of $388. Next month, 400 units of electricity and 150 units of gas were used for a total cost of $277. Find the cost per unit of gas.

Answer: B, non response bias, and sampling bias

Step-by-step explanation:

Non response bias is when there is a huge difference between people that responded or took part in the polls and people that didn't respond, since we are told the response rate was 24% and sampling bias because it is said that most people using telephones belong to the party of candidate A, so using a telephone poll makes the sampling biased

The incorrect prediction occurred due to non-response bias, where not all opinions were represented due to a low response rate, and sampling bias, where the sampling method resulted in an under-representation of the whole population.

In this election prediction scenario, two types of biases influenced the incorrect prediction. The first is a non-response bias. Only 24% of people responded to the poll which means the opinions of the remaining 76% of people are not represented in the survey results. This can cause a distortion in the data and result in an inaccurate prediction. Secondly, there was a sampling bias present. The poll was conducted via telephone directories, and at the time, most telephone households were supportive of Candidate A's party. This means that the sample frame does not accurately represent the target population, leading to an 'undercoverage' issue. As a result of these biases, the newspaper predicted that Candidate A would win, but in fact, Candidate B won with about 62% of the popular vote.

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Answer:

1. 20-15/0-8= -5/8

2. In a positive slope the Y value increases as the X value increases (as the line moves towards the right it gets higher). In a negative slope the Y value decreases as the X value increases (as the line moves towards the right it gets lower). (Question 3 is in here)

4. It depends on the amount of time she's been driving

Answer:

16,17,18

Step-by-step explanation:

\underline{\text{Define Variables:}}

Define Variables:

​

May choose any letters.

\text{Let }d=

Let d=

\,\,\text{the number of dimes}

the number of dimes

\text{Let }q=

Let q=

\,\,\text{the number of quarters}

the number of quarters

\text{\textquotedblleft at most 25 coins"}\rightarrow \text{25 or fewer coins}

“at most 25 coins"→25 or fewer coins

Use a \le≤ symbol

Therefore the total number of coins, d+qd+q, must be less than or equal to 25:25:

d+q\le 25

d+q≤25

\text{\textquotedblleft at least \$4.60"}\rightarrow \text{\$4.60 or more}

“at least $4.60"→$4.60 or more

Use a \ge≥ symbol

One dime is worth $0.10, so dd dimes are worth 0.10d.0.10d. One quarter is worth $0.25, so qq quarters are worth 0.25q.0.25q. The total 0.10d+0.25q0.10d+0.25q must be greater than or equal to \$4.60:$4.60:

0.10d+0.25q\ge 4.60

0.10d+0.25q≥4.60

\text{Plug in }\color{green}{7}\text{ for }d\text{ and solve each inequality:}

Plug in 7 for d and solve each inequality:

Jayden has 7 dimes

\begin{aligned}d+q\le 25\hspace{10px}\text{and}\hspace{10px}&0.10d+0.25q\ge 4.60 \\ \color{green}{7}+q\le 25\hspace{10px}\text{and}\hspace{10px}&0.10\left(\color{green}{7}\right)+0.25q\ge 4.60 \\ q\le 18\hspace{10px}\text{and}\hspace{10px}&0.70+0.25q\ge 4.60 \\ \hspace{10px}&0.25q\ge 3.90 \\ \hspace{10px}&q\ge 15.60 \\ \end{aligned}

d+q≤25and

7+q≤25and

q≤18and

​

0.10d+0.25q≥4.60

0.10(7)+0.25q≥4.60

0.70+0.25q≥4.60

0.25q≥3.90

q≥15.60

​

\text{The values of }q\text{ that make BOTH inequalities true are:}

The values of q that make BOTH inequalities true are:

\{16,\ 17,\ 18\}

{16, 17, 18}

Jayden must have at least 16 quarters in order to have at most 25 coins worth at least $4.60 combined.

Let's assume Jayden has x quarters. Since Jayden has 7 dimes, he has a total of 7 + x coins. The value of a dime is $0.10, so the value of the dimes is 7 × $0.10 = $0.70.

The value of a quarter is $0.25, so the value of the quarters is x × $0.25 = $0.25x. The total value of all the coins is at least $4.60, so we have the equation:

$0.70 + $0.25x ≥ $4.60.

Simplifying the equation, we get:

$0.25x ≥ $4.60 - $0.70

$0.25x ≥ $3.90

x ≥ $3.90 / $0.25

x ≥ 15.6

Since we can't have a fraction of a coin, Jayden must have at least 16 quarters in order to have at most 25 coins worth at least $4.60 combined.

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The perimeter of Kayla's garden including the walkway can be calculated using the formula P = 2(4 + 2w) + 2(3 + 2w), where w is the width of the walkway. This can also be rearranged as P = 2*(4 + 3 + 2w + 2w).

The perimeter of a rectangle, like the garden in question, is usually calculated by adding up the lengths of all its sides. In this case, however, the garden is bordered by a walkway of width w. Thus, to calculate the total perimeter, including the walkway, we need to account for this additional width on all four sides of the garden.

The original dimensions of the garden are 4 feet by 3 feet. With the walkway, the new dimensions become (4+2w) feet by (3+2w) feet, because the width of the walkway is added on both sides of the lengths.

Therefore, the two equivalent expressions for the perimeter, P, of Kayla's garden, including the walkway, are P = 2(4 + 2w) + 2(3 + 2w) or simply rearranged as P = 2*(4 + 3 + 2w + 2w). In these expressions, w is the width of the walkway.

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Answer:

Cost of each banana smoothies is 3.25 and Cost of each Strawberry smoothie is 3.75.

Step-by-step explanation:

Given:

Number of strawberry smoothies =3

Number of banana smoothies = 5

Total cost = 27.50

We need to find cost of strawberry cookies and cost of banana cookies.

Solution:

Let cost of each banana smoothies be 'x'.

Given:

The strawberry smoothie cost 0.50 more than the banana smoothies.

So we can say that;

Cost of each Strawberry smoothie = [tex]0.5+x[/tex]

Now we can say that Total cost is equal to sum of Number of strawberry smoothies multiplied by Cost of Strawberry smoothie and Number of banana smoothies multiplied by cost of banana smoothies.

framing in equation form we get;

[tex]3(x+0.5)+5x=27.5[/tex]

Applying distributive property we get;

[tex]3x+1.5+5x=27.5\\\\8x+1.5=27.5[/tex]

Subtracting both side by 1.5 we get;

[tex]8x+1.5-1.5=27.5-1.5\\\\8x=26[/tex]

Dividing both side by 8 we get;

[tex]\frac{8x}{8}=\frac{26}{8}\\\\x=3.25[/tex]

Cost of each banana smoothies = 3.25

Cost of each Strawberry smoothie = [tex]0.5+x=0.5+3.25=3.75[/tex]

Hence Cost of each banana smoothies is 3.25 and Cost of each Strawberry smoothie is 3.75.

Answer:

the slope is 4

Answer:

h=2A/b

Step-by-step explanation:

A=1/2bh

Isolate h by moving 1/2 and b to the other side of the equation.

Divide each side by 1/2,which is multiplying by 2, which gives you 2A=bh.Now divide each side by b, which gives you 2A/b=h. Turn it around.

2A/b=h becomes h=2A/b

Answer:

h=2A/b

Step-by-step explanation:

Answer:the admission cost for each player is $22.5

Step-by-step explanation:

Let x represent the admission cost for each player.

Luke's basketball team went to an amusement park at the end of the season. The cost of the admission for 5 coaches and 12 players was 407.50. The admission cost for each coach was 27.50. This means that

5 × 27.50 + 12x = 407.5

137.5 + 12x = 407.5

Subtracting 137.5 from the left hand side and the right hand side of the equation, it becomes

12x + 137.5 - 137.5= 407.5 - 137.5

12x = 270

Dividing the left hand side and the right hand side of the equation by 12, it becomes

12x/12 = 270/12

x = 270/12 = 22.5

Answer:

$22.5

Step-by-step explanation:

To find the cost for each player, first, let us find the cost of all coaches, then the rest will be for the players

Step 1: Multiply the cost for 1 coach by 5

[tex]27.50 \times 5 = 137.5[/tex]

Step 2: Subtract the result from the total amount of both players and coaches

[tex]407.50 - 137.5 = 270[/tex]

Now we have found the total cost of all 12 players. Next up, we need to find the cost of just one player

Step 3: Divide the result by the number of players

[tex]270 \div 5[/tex]

[tex]= \frac{270}{5}[/tex]

[tex]= 22.5[/tex]

The admission cost for each player was 22.5 dollars.

Answer:

24

Step-by-step explanation:

The can will hold 75.36 inch³ of soup.

The volume of a cylinder with base radius 'r' and height 'h' is,

V = πr²h. If its base diameter is d, then we have d = r/2.

Given:

Radius = 2 inches

Height = 6 inches

So, Volume of Cylinder = πr²h

Now, put r= 2 inches and h= 6 inches

Then, Volume of cylinder = 3.14 x 2 x 2 x 6

Volume of Cylinder = 3.14 x 24

Volume of Cylinder = 75.6 inch³

Hence, the can hold 75.36 inch³.

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Answer:

The answer to your question is 2i

Step-by-step explanation:

                                             [tex]\sqrt[4]{-16}[/tex]

- Get the prime factors of -16

                                                  - 16   2

                                                   -  8  2

                                                   -  4  2

                                                   -  2  2

                                                       1

                                   16 = 2⁴

- Express the -16 as a power

                          [tex]\sqrt[4]{-2^{4}}  or   \sqrt[4]{2^{4}i^{2}}[/tex]

Remember that -1 = i²

- Get the fourth root of -16

                                         2i

Question is not proper, Proper question is given below;

Consuelo's living room is in the shape of a rectangle and has an area of 360 square feet. The width of the living room is  [tex]\frac{5}{8}\ ft[/tex] its length. What is the length of the living room?

Answer:

Length of the living room is 24 feet.

Step-by-step explanation:

Given:

Area of the living room = [tex]360 \ ft^2[/tex]

We need to find the length of the living room.

Solution:

the length of the living room be 'l'.

Given:

Width of the living room [tex]\frac{5}{8}\ ft[/tex] of it length.

width [tex]w= \frac{5}{8}l[/tex]

It has been given that living room is in rectangular format.

So we can say that;

Area of living room is equal to length of the living room times width of the living room.

framing in equation form we get;

[tex]l\times w=360\\\\l\times\frac{5}{8}l=360\\\\\frac{5}{8}l^2=360[/tex]

Now Multiplying both side by [tex]\frac{8}{5}[/tex] we get;

[tex]\frac{5}{8}l^2\times\frac{8}{5}=360\times\frac{8}{5}\\\\l^2= 576[/tex]

Taking square root on both side we get;

[tex]\sqrt{l^2} =\sqrt{576} \\\\l=24 \ ft[/tex]

Hence Length of the living room is 24 feet.

Answer:

cosecant

Step-by-step explanation:

Inverse Cosine

cos-1

Cos-1

arccos

Arccos

The inverse function of cosine.

Basic idea: To find cos-1 (½), we ask "what angle has cosine equal to ½?" The answer is 60°. As a result we say cos-1 (½) = 60°. In radians this is cos-1 (½) = π/3.

More: There are actually many angles that have cosine equal to ½. We are really asking "what is the simplest, most basic angle that has cosine equal to ½?" As before, the answer is 60°. Thus cos-1 (½) = 60° or cos-1 (½) = π/3.

Details: What is cos-1 (–½)? Do we choose 120°, –120°, 240°, or some other angle? The answer is 120°. With inverse cosine, we select the angle on the top half of the unit circle. Thus cos-1 (–½) = 120° or cos-1 (–½) = 2π/3.

In other words, the range of cos-1 is restricted to [0, 180°] or [0, π].

Note: arccos refers to "arc cosine", or the radian measure of the arc on a circle corresponding to a given value of cosine.

Technical note: Since none of the six trig functions sine, cosine, tangent, cosecant, secant, and cotangent are one-to-one, their inverses are not functions. Each trig function can have its domain restricted, however, in order to make its inverse a function. Some mathematicians write these restricted trig functions and their inverses with an initial capital letter (e.g. Cos or Cos-1). However, most mathematicians do not follow this practice. This website does not distinguish between capitalized and uncapitalized trig functions.



See also

Inverse trigonometry, inverse trig functions, interval notation

Answer: 15/16

Step-by-step explanation:

There will be 16 outcomes for 4 coins=2^4

Probability of only head is : P(C)=1/16

P(C) + P(C') = 1

P(C') = 1 - P(C)

P(C') = 1 - 1/16

Take the l.c.m

P(C') = (16-1) / 16

P(C') = 15/16

So the probability of getting at least 1 tail is 15/16

Answer:

D 0.94

Step-by-step explanation:

when solved the answer is 15/16. This equals 0.9375 which rounded to the second decimal  = 0.94

Answer:

Customer will save 8.3%.

Step-by-step explanation:

Let the amount of bill paid by the customers = $x

Local tourism tax = 9%

Total amount of bill including local taxes

= (x + 9% of x)

= x + 0.09x

= 1.09x

If Lucy decides to pay the tax portion of the bill = 0.09x

Then percentage saving by the customer = [tex]\frac{\text{Taxes on bill}}{\text{Bill amount including tax}}\times 100[/tex]

= [tex]\frac{0.09x}{1.09x}\times 100[/tex]

= 8.26%

≈ 8.3%

Therefore, customer will see 8.3% saving.

Answer:

cohort study

Step-by-step explanation:

Given that an  investigator reviewed the medical records of 200 children seen for care at Boston Medical Center in the past year who were between the ages 8 and 12 and identified 40 children with asthma. He also identified 40 children of the same ages who were free of asthma. Each child and their family were interviewed to assess whether there might be an association between certain environmental factors such as exposure to second-hand smoke.

The objective of this experiment is to test the causes of the disease asthma and to find the risk factors and environment causing this disease.

So this cannot come under randomized control nor case control.

Cross over study is to put to two different environments two groups and study.  But here nothing is influenced actual environments are studied

Hence this comes under cohort study

Answer:

cohort study

Step-by-step explanation:

Answer:

Denominator

x = 12

Step-by-step explanation:

Let x be the denominator of the fraction at point y.

Given:

Point X is at 2/3 on a number line from 0.

On the same line, point y is the same point from 0.

Numerator of the fraction at point y is 8.

We need to find the denominator of the fraction at point y.

Solution:

From the above statement the distance from 0 to point X and 0 to point Y is same, so point X is equal to Y.

[tex]\frac{2}{3} =\frac{8}{x}[/tex]

By cross multiplication.

[tex]x=\frac{8\times 3}{2}[/tex]

[tex]x= \frac{24}{2}[/tex]

[tex]x = 12[/tex]

Therefore, the denominator of the fraction at point y is 12.

Answer:

8.4 cm

Step-by-step explanation:

The longest side of an acute isosceles triangle is 12 centimeters.

Let x be the length of the smallest side

Isosceles triangle has one longest side and two smallest sides

so its acute triangle

[tex]c^2<a^2 +b^2[/tex]

where c is the longest side

a  and b are two shortest sides 'x'

[tex]c^2<x^2 +x^2[/tex]

[tex]12^2<x^2 +x^2[/tex]

[tex]144<2x^2[/tex]

divide both sides by 2

[tex]72<x^2[/tex]take square root on both sides

[tex]8.4<x[/tex]

So 8.4 cm

Answer: 19 paddle boards were rented.

Step-by-step explanation:

Let x represent the number of surfboards that were rented.

Let y represent the number of paddleboards that were rented.

A total of 44 surfboards and paddleboards were rented. It means that

x + y = 44

For a two day rental at the surf shop, it cost $45 to rent a surfboard and $60 to rent a paddleboard.

The total cost of surfboards and paddleboards rented was $2265. This means that

45x + 60y = 2265 - - - - - - - - - 1

Substituting x = 44 - y into equation 1, it becomes

45(44 - y) + 60y = 2265

1980 - 45y + 60y = 2265

- 45y + 60y = 2265 - 1980

15y = 285

y = 285/15 = 19

x = 44 - y = 44 - 19

x = 25

Answer:a) {(a,b)[a is required to read book b or has read book b]}

b) {(a,b)[a has read book b that he was required to read)]

c) {(a,b)[a is either required to read book b or has read it but he has not read both)]

d) {(a,b)[a is required to read book b and he is yet to read book b)]

e) {(a,b)[a has read book b that was not required)]

Step-by-step explanation: The answers is a description of the explanation

The question asks about various operations with the sets R₁ and R₂, which represent the students and the books they are required to read and have read respectively. It looks at the union, intersection, symmetric difference, and difference of these two sets in relation to each other, where variables 'A' and 'B' represent a student and a book respectively.

This is a question in set theory. We will be defining the different operations performed on the ordered pairs of two relations R₁ and R₂. Let's consider 'A' as a student studying in your school and 'B' be a book in the library, the ordered pairs (A, B) indicate the relationship between the student and the book.

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Answer:

The answer to your question is x = 52° and y = 137°

Step-by-step explanation:

Process

1.- Find the value of x using the large right triangle, remember that the sum of the internal angles in a triangle equals 180°.

   x  + 38 + 90 = 180

  x = 180 - 90 - 38

  x = 52°

2.- To find y, we notice that x and y -9 are supplementary angles so their sum gives 180°.

           x + y - 9 = 180

Substitution

          52 + y - 9 = 180

          y = 180 + 9 - 52

          y = 137°

Answer:

Water level in the reservoir is falling at the rate of 0.398 ft per minute.

Step-by-step explanation:

From the figure attached,

Water level in the reservoir has been given as 10 feet and radius of the reservoir is 4 feet.

Let the level of water in the reservoir after time t is h where radius of the water level becomes r.

ΔABE and ΔCDE are similar.

Therefore, their corresponding sides will be in the same ratio.

[tex]\frac{r}{h}=\frac{4}{10}[/tex]

[tex]r=\frac{2}{5}h[/tex] --------(1)

Now volume of the water V = [tex]\frac{1}{3}\pi r^{2}h[/tex]

From equation (1),

V = [tex]\frac{1}{3}\pi (\frac{2}{5}h)^{2} h[/tex]

V = [tex]\frac{4\pi h^{2}\times h}{75}[/tex]

[tex]\frac{dV}{dt}=\frac{4\pi }{75}\times \frac{d}{dt}(h^{3})[/tex]

[tex]\frac{dV}{dt}=\frac{4\pi }{75}\times (3h^{2})\frac{dh}{dt}[/tex]

[tex]\frac{dV}{dt}=\frac{12\pi h^{2}}{75}\times \frac{dh}{dt}[/tex]

Since [tex]\frac{dV}{dt}=5[/tex] feet³ per minute and h = 5 feet

[tex]5=\frac{12\pi (5)^{2}}{75}\times \frac{dh}{dt}[/tex]

[tex]5=4\pi \frac{dh}{dt}[/tex]

[tex]\frac{dh}{dt}=\frac{5}{4\pi}[/tex]

[tex]\frac{dh}{dt}=0.398[/tex] feet per minute

Therefore, water level in the reservoir is falling at the rate of 0.398 feet per minute.

Answer:

Bianca's height = 42 inches

Step-by-step explanation:

Let x be the Bianca height.

Given:

Meredith height = 60 inches

We need to find the Bianca height.

Solution:

From the given statement the Meredith's height is [tex]\frac{2}{3}[/tex] of Bianca's height plus 32 inches, so the equation is.

Meredith's height = [tex]\frac{2}{3}(Bianca\ height)+32[/tex]

Substitute Meredith's height in above equation.

[tex]60=\frac{2}{3}x+32[/tex]

Now we solve the above equation for x.

[tex]\frac{2}{3}x=60-32[/tex]

[tex]\frac{2}{3}x=28[/tex]

By cross multiplication.

[tex]x=\frac{3\times 28}{2}[/tex]

28 divided by 2.

[tex]x= 3\times 14[/tex]

[tex]x=42\ in[/tex]

Therefore, the height of the Bianca is 42 inches.

Answer:the coastline is 20000 miles.

The land boundaries are 12000 miles.

Step-by-step explanation:

The length of the entire border of the Unites States is approximately 32,000 miles.

5/8 of the entire length is the coastline. It means that the length of the coastline of the U.S would be

5/8 × 32000 = 20000 miles.

Therefore, the length of the boundaries of the US would be

32000 - 20000 = 12000 miles.

Answer:

The first graph

Step-by-step explanation:

From the definition of [tex]h[/tex] we can see that:

                                 [tex]h(2)=-3\cdot 2+2 = -6+2=-4[/tex]

So, we can eliminate the third answer.

Now we can take for example [tex]x=4[/tex]:

From the definition of [tex]h[/tex] we can see that:

                                   [tex]h(4)=\frac{1}{2}\cdot 4-4 = 2-4=-2[/tex]

If we take a look at the two remanining graphs we can see that at the first graph indeed it is h(4)=-2,and on the second graph it is h(4)=-6

So, the correct answer is the first graph

Answer: 197,443,926,105,102,399,225,573,693

Step-by-step explanation:

Here we use combination which is the selection of all or part of a set of objects or items without considering the order of selection.

Mathematically, The number of 'r' combinations from 'n' elements is given as :

nCr = n!÷((n-r)!r!)

From the question above :

n=99 r=66

99C66 = 99!÷((99-66)!66!)

99!÷(33!66!) = 197,443,926,105,102,399,225,573,693

There are 197,443,926,105,102,399,225,573,693 different possible routes.

Answer:

  x = π

Step-by-step explanation:

The circumference of the circle is given by ...

  C = 2πr = 2π(2) = 4π

The perimeter of a square of side length x is given by ...

  P = 4x

You want the perimeter equal to the circumference, so ...

  4π = 4x

  π = x . . . . . . . divide by 4

The value of x is π.

The side length x of the square is the same as the radius of the circle, which is π units, because the perimeter of the square, 4x units, is set equal to the circumference of the circle, 4π units.

It is asked to determine the side length x of a square when its perimeter is equal to the circumference of a circle with radius 2 units.

To find the perimeter of a square, you multiply the side length by 4, since a square has four equal sides. Thus, the perimeter of the square is 4x units.

The formula for the circumference of a circle is [tex]C = 2\pi r,[/tex] where r is the radius of the circle.

Given that the radius is 2 units, the circumference of the circle would be [tex]2\pi (2) = 4\pi[/tex]units.

By setting the two equal to each other:

[tex]4x = 4\pi[/tex]

Divide both sides by 4 to isolate x:

[tex]x = \pi[/tex]

Therefore, the side length x of the square is π units.

Answer:

she should beat a speed of  v₂ = 6.04 m/s in order to win the competition

Step-by-step explanation:

Since the momentum p is defined as

p = m*v

where

m= mass of the ball

v= velocity of the ball

denoting 1 and 2 as the first and second bowler , then to reach the momentum of the first bowler

p₂=p₁

therefore

m₁*v₁ = m₂*v₂

v₂ = v₁ * (m₁/m₂)

replacing values

v₂ = v₁ * (m₁/m₂) =8.6 m/s * (4.5 kg/6.4 kg ball) = 6.04 m/s

then since the momentum p = m*v increases with increasing v (at constant m)  , she should beat a speed of  v₂ = 6.04 m/s in order to win the competition

The percentage of correct answers out of the total question is 25%.

The Latin phrase "per centum," which means "by the hundred," is where the English word "percentage" comes from. Percentage segments are those with a numerator of 100. In other words, it is a connection where the whole is always deemed to be valued 100.

As per the given information in the question,

The number of incorrect questions = is 42

The number of Correct questions = 14

So, the total number of questions is,

42 + 14 = 56

Let the percentage of correct questions be x.

x = 14/56 × 100

x = 1400/56

x = 25%  

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Answer:

Metaphysics

Step-by-step explanation:

Metaphysics is a system of reasoning or process that is often employed to find answers through examining fundamental nature of reality, the relationship between minds and also knowledge.

The systematic use of critical reasoning to try to find answers to fundamental questions about reality, morality, and knowledge is called philosophy.

The systematic use of critical reasoning to try to find answers to fundamental questions about reality, morality, and knowledge is called philosophy.

Philosophy is the discipline that seeks to explore and understand the fundamental aspects of existence, including the nature of reality, the principles of ethics and morality, and the limits of human knowledge. It involves the rigorous examination of concepts, arguments, and ideas to gain deeper insights into the nature of the world and our place in it.

Philosophers engage in critical thinking and analysis to address questions related to the meaning of life, the nature of truth, the basis of ethics, and the foundations of human understanding. Through philosophical inquiry, individuals seek to develop a deeper and more comprehensive understanding of the complex issues that shape our lives and society.

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Answer:

100 blueberries and 40 blackberries

Step-by-step explanation:

Multiply each by 20 and you have 5 x 20 = 100 and 2 x 20 = 40