Question 585218
I'll do the first few to get you going. 


# 2

The key words are "per pound", which means that this is a discrete variable.


So the answer is choice A

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# 6

As x increases by 1, f(x) increases by 4. So the slope is 4/1 = 4. So the equation is f(x) = 4x (since this is the only choice with a slope of 4)

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# 7 


As x increases by 1, f(x) increases by 1. So the slope is 1/1 = 1. So the equation is f(x) = x + 4 (since this is the only choice with a slope of 1 and plugging in x = 3 gives you 7)

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