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sweet-ann [11.9K]

3 years ago

12

A used bookstore will trade 2 of its books for 3 of yours if Val brings in 18 books to trade how many books can she get from the

store

1 answer:

kicyunya [14]3 years ago

8 0

We have an equation: ?/18 = 2/3

Cross multiply:
3*? = 2*18
⇒ ?= 2*18/3= 12.

Val can get 12 books from the store~

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When a number is decreased by 20% of itself, the result is 128. what is the number?

andriy [413]

The number was 160 because 5/4•128=160. 5/4 represents inverting 80% and multiplying it by the number to determine how the result became 128. For checking over all you have to do is do 4/5 or 80%•160 which shall give you 128.

4 0

3 years ago

The graph of F(x), shown below, has the same shape as the graph of G(X) =

defon

Answer: (X-3)^4

Step-by-step explanation:

To shift a function left, add inside the function's argument: f (x + b) gives f (x)shifted b units to the left. Shifting to the right works the same way; f (x – b) is f (x) shifted b units to the right.

Therefore, the equation is $F(x) = G(x-3) = (X-3)^4$

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3 years ago

Mr. Moore has 21 feet of wallpaper he cuts it into sections that are each 3 feet long how many

9966 [12]

Total = 21 feet

if each is 3 feet

21/3 = 7

Therefore, there are 7 sections

5 0

3 years ago

Outside temperature over a day can be modeled as a sinusoidal function. Suppose you know the temperature is 80 degrees at midnig

Vladimir [108]

Answer:

The equation is given by:

$D(t) = 80 + 9\sin{0.2618t}$

Step-by-step explanation:

Sine function:

Has the following format:

$y = A\sin{bx}$

In which A is the amplitude and $\frac{2\pi}{b}$ is the period.

Suppose you know the temperature is 80 degrees at midnight and the high and low temperature during the day are 89 and 71 degrees

This means that the amplitude of the sinusoidal variation function is 89 - 80 = 80 - 71 = 9. This means that $A = 9$

During a 24-hour day, which means that the period is 24. So

$\frac{2\pi}{b} = 24$

$24b = 2\pi$

$b = \frac{2\pi}{24}$

$b = 0.2618$

So the variation is:

$V(t) = 9\sin{0.2618t}$

Assuming t is the number of hours since midnight, find an equation for the temperature, D, in terms of t.

Initial temperature of 80, so:

$D(t) = 80 + V(t) = 80 + 9\sin{0.2618t}$

8 0

3 years ago

Which equation represents the statement below?

Sergio [31]

The answer is option A

Step-by-step explanation:

Thirteen less than a number is written as

n - 13

Equate it to 42

We have

n - 13 = 42

Hope this helps you

3 0

3 years ago