Multiplying -15 by 60 yields -900, so the amount of water in the pool changes by -900 gallons in one hour.
Multiply 60 by .75, which gives you 45 Points. The answer is B.

Now multiple the coefficients and add the exponents with common bases

Now write your final expression

Hope I helped!
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We are asked to find the slope of this graph; we are provided with two points:



- What we need in order to find the slope are two points and the slope formula.
Here's the formula:

Where
y2 and y1 are y-coordinates
x2 and x1 are x-coordinates
Substitute the values:

Simplify!

Simplify more!

Hope it helps you out! :D
Ask in comments if any queries arise.
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