The Bernards are trying to determine their babysitter's rates but are to embarrassed to just ask her. They were charged $20 for 2 hours last week, but only $31 for 4 hours this week. What is the formula to determine A(Amount) given t(time in hours)?

Charlie

Here, we want to check if polynomials is closed under subtraction or not

To check this, we proceed either ways, if the answer is same, then it is closed. If otherwise, then it is not

We have;

As we can see, both results are not equal

If subtraction was closed under polynomials, then the results of both should have been equal. This means Charlie is correct.

\(~\hspace{7em}\textit{negative exponents} \\\\ a^{-n} \implies \cfrac{1}{a^n} ~\hspace{4.5em} a^n\implies \cfrac{1}{a^{-n}} ~\hspace{4.5em} \cfrac{a^n}{a^m}\implies a^na^{-m}\implies a^{n-m} \\\\[-0.35em] ~\dotfill\\\\ (4)^{\frac{-4}{2}} \implies (4)^{-2}\implies 4^{-2}\implies \cfrac{1}{4^2}\implies \cfrac{1}{16}\)

A regular polygon is a polygon with all sides and angles congruent. It exhibits symmetry and uniformity in its sides and angles, creating a visually appealing shape.

A polygon with all sides and angles congruent is called a regular polygon. In a regular polygon, all sides have the same length, and all angles have the same measure. This uniformity in the lengths and angles of the polygon's sides and angles gives it a symmetrical and balanced appearance.

Regular polygons are named based on the number of sides they have. Some common examples include the equilateral triangle (3 sides), square (4 sides), pentagon (5 sides), hexagon (6 sides), and so on. The names of regular polygons are derived from Greek or Latin numerical prefixes.

In a regular polygon, each interior angle has the same measure, which can be calculated using the formula:

Interior angle measure = (n-2) * 180 / n

Where n represents the number of sides of the polygon.

The sum of the interior angles of any polygon is given by the formula:

Sum of interior angles = (n-2) * 180 degrees

Regular polygons have several interesting properties. For instance, the

exterior angles of a regular polygon sum up to 360 degrees, and the measure of each exterior angle can be calculated by dividing 360 degrees by the number of sides.

Regular polygons often possess symmetrical properties and are aesthetically pleasing. They are commonly used in design, architecture, and various mathematical applications.

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Answer:

-4.8

hope you succeed :]

Step-by-step explanation:

Answer:

https://learning-ph.com/math/question7489744

pls check this site

Step-by-step explanation:

Answer:

104 m²

Step-by-step explanation:

There is a 1 m sidewalk around the garden

Then length = 30 + 1 + 1 = 32 m

and width = 20 + 1 + 1 = 22 m

Area = 32 × 22 = 704 m²

Area of garden = 30 × 20 = 600 m²

Area of sidewalk = 704 - 600 = 104 m²

Step-by-step explanation:

23.5597 hope this helpsss

Answer: .416666667

Step-by-step explanation: Take 80 and divide it by 192.0= .416666667

A two-step equation is an equation which needs two steps to solve.

In this case, answer choice "C" is a two-step equation.

2x + 9 = 21. Subtract 9 from both sides

2x = 12. Divide both sides by 2.

x = 6.

Answer choice "B" just gives us the answer.

Answer choice "A" needs only one step to solve the equation.

x + 9 = 21. Subtract 9 from both sides.

x = 12.

The equation with two-step solution is x +9=21.

Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.

It demonstrates the equality of the relationship between the expressions printed on the left and right sides. LHS = RHS is a common mathematical formula.

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given:

A) x+ 9 = 21

Subtract 9 from both side we get

x +9 -9 = 21 -9

x = 12

B) x = 11

C) 2x + 9 = 21

Subtract 9 from both side we get

2x = 12

Divide both side by 2

x = 6.

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Ganesh received Rs. 343.35 in change or balance because he provided a Rs. 500 note to the bookseller.

Ganesh purchased a book worth Rs. 156.65 from a bookseller and gave him a Rs. 500 note.

Ganesh gave the bookseller a Rs. 500 note, which was Rs. 500. The bookseller's payment to Ganesh is determined by the difference between the amount Ganesh paid for the book and the amount of money the bookseller received from Ganesh, which is the balance.

As a result, the balance received by Ganesh is calculated as follows:

Rs. 500 - Rs. 156.65 = Rs. 343.35

Ganesh received Rs. 343.35 in change or balance because he provided a Rs. 500 note to the bookseller.

Hence, the answer to the given question is Rs. 343.35.

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Answer:

The distance-time graph of the journey would be as follows:

From 8am to 8:01am, the car travels 0 miles (at 8am, it leaves London)

From 8:01am to 9:01am, the car travels 60 miles (at a constant speed of 60mph)

From 9:01am to 9:31am, the car travels 0 miles (the driver takes a break of 30mins)

From 9:31am to 12:51pm, the car travels 140 miles (at a constant speed of 70mph)

The graph would be a line with a slope of 60 for the first hour, a flat line for the 30 minutes break, and then a line with a slope of 70 for 2 hours and 20 minutes.

Note: Since we don't have a time-scale and time unit, this graph is just a representation of the pattern of the journey, and the actual values are not accurate.

Answer:

WX < YW < XY

Step-by-step explanation:

Sum of all angles of triangle = 180

  114 + 53 + ∠y = 180

           167 + ∠Y = 180

                   ∠Y = 180 - 167

                  ∠Y = 13

The side opposite to smallest angle is shortest.

Angles in ascending order: ∠Y < ∠X < ∠W

Sides in ascending order: WX < YW < XY

Answer:

486,732 hope this helps

Answer:

A=115 and B = 65

Step-by-step explanation:

You know this because of the alternate angles are congruent in a parallelogram

Answer:

4

Step-by-step explanation:

Answer:

The height of the window is 150 centimeters.

Step-by-step explanation:

Use ratio and proportion to find the height of the window.

\(\frac{h}{60cm} = \frac{210cm}{84cm}\)

Cross multiply

\(h = \frac{210cm(60cm)}{84cm} \\h = \frac{12600cm^2}{84cm} \\h = 150 cm\)

Answer:

x = 1.5

y = 8

3/4 = 1.2/2

3/4 = 6/8

The standard deviation of (X - Y) is 5.39 rounded to two decimal places.

Given the variance of the random variables X and Y, v(X) = 36, v(Y) = 25, and the correlation coefficient ρ = 0.64 and we have to find sd(X - Y).

We know that variance can be written as

V(X) = E(X²) - [E(X)]²σ(X)

= √[V(X)]V(Y)

= E(Y²) - [E(Y)]²σ(Y)

= √[V(Y)]

Covariance of two random variables X and Y can be written as

Cov(X, Y) = E(XY) - E(X)E(Y)

Cov(X, Y) = ρσ(X)σ(Y)σ(X - Y)²

= V(X) + V(Y) - 2Cov(X, Y)σ(X - Y)²

= 36 + 25 - 2 × (0.64 × √(36) × √(25))σ(X - Y)

= √(36 + 25 - 32)σ(X - Y)

= √29σ(X - Y)

= 5.39 [rounded to 2 decimal places]

Therefore, the standard deviation of (X - Y) is 5.39.

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Work Shown:

2.54 cm = 1 inch

2.54/2.54 cm = 1/2.54 inch  ...... divide both sides by 2.54

1 cm = 0.39370078740158 inches

1 cm = 0.39 inches

Answer: its c

Step-by-step explanation:

took the quiz

Answer:

Step-by-step explanation:

its C I got yall

Answer:

True

Step-by-step explanation:

This is the case when the result is True. The substituted variables in the argument must equal a conclusion that is also True. For example, if the premises are True, then the conclusion of the valid argument form needs to output a True conclusion as well. This makes the argument valid. Otherwise, the argument would be invalid if two True premises output a conclusion that is equal to False.

Answer: 9:4

Step-by-step explanation: Total is 30. Add 18 and 4 to see how many students were already surveyed, (22) and then subtract that from 30. Then you get 8, so the ratio is 18:8. Then simplify by dividing both numbers by 2, so you get 9:4. Hope that helps :)

Answer:

x=-2

Step-by-step explanation:

If the question is asking for the intersection point, the answer is x=-2 or (-2,1) depending on if the teacher is asking for the intersection or value of x where it itersects

If the question is asking what the equation of the parabola is I would guess it is (x+1/2)^2 -4

I say go with x=-2 though

The total number of questions is an illustration of proportions

The total number of questions is 200

From the question, we have:

Grade = 87%

Questions answered = 174

Represent the total questions with x.

So, the total question is calculated as:

174 = 87% * x

Make x the subject

x = 174/87%

Evaluate the quotient

x = 200

Hence, the total number of questions is 200

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Answer:

C

Step-by-step explanation:

No doubt thats the correct answer guys, thank me later

B, median = mean. The explanation is that the graph shows a fairly symmetrical distribution of temperatures, with the highest point (mode) being around 35 degrees and the middle point (median) also being around 35 degrees.

Therefore, the median and mean would be approximately the same. The conclusion is that the temperatures in Elmira, New York, were relatively consistent during this 5-day period in January.

first need to determine the mean, median, and mode of the high temperatures for the 5-day period. Unfortunately, the graph you mentioned is not available for me to see. However, I can help you analyze the data once you provide the high temperatures for each of the 5 days.

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Answer: x=12y/-8-3

Step-by-step explanation: image below

Answer:

Step-by-step explanation:

L = 3*w + 1                      Given

P = 2*(L + w)                   Formula for Perimeter. Substitute for L    

P = 2*(3w + 1 + w)           Combine

P = 2*(4w + 1)                  

P = 58                             Given

58 = 8w + 2                    Remove the brackets

58 - 2 = 8w                     Subtract 2

56 = 8*w                         Divide by 8

56/8 = w

7 = w

================

Find L

L = 3*w + 1

L = 3*7 + 1

L = 22

================

Check

2L + 2W  = 58

2*22 + 2*7 =? 58

44 + 14 = ? 58

58 = 58

The answer checks.

a) 1. The backpack weight sample mean is 6.375 pounds.

a) 2. The backpack weight sample mean is 6.375 pounds.

a) 3. The backpack weight sample mean is 6.625 pounds.

b) The range of the sample means is between 6.375 and 6.625, which approaches 0.250 pounds, plus or minus.

c) Since the students are using the sample means to estimate the mean backpack weight of their schoolmates, the true statements are A. and D.

The farther the range of the sample means is from O, the less confident they can be in their estimate.

A sample mean is a statistic computed from a sample of data or variables.

The sample mean represents the average value of the sample data.

The range describes the difference between the largest number and the smallest number.

Thus, based on the range of the sample means, the farther it is from 0, the less confident the students can be in their estimate.

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Answer:

There is a possibility of births and deaths. This also, informs us of a larger population.

Step-by-step explanation:

This is because there are 333% more rabbits without a tag than with one. This giving us the possibility shown above!

Mark as brainliest

Answer:  560 total rabbits

Step-by-step explanation:

Your assumptions are great but you can also add the assumption that the ratio of the rabbits caught on Monday is the same ratio of the rabbits caught on Tuesday.

\(\text{Tuesday:}\quad \dfrac{15\ tags}{70\ rabbits}=\dfrac{3\ tags}{14\ rabbits}\ \leftarrow simplified\)

Assumption:

3/14 of the total rabbits on the farm = 120 tagged on Monday

Let r represent the total rabbits on the farm

then (3/14)r = 120

                r = 120(14/3)

                r = 560