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The function f(x) = 3x+7 represents the cost to rent x movies each month from Netflix. Alex has $15 now. How many more dollars does he need to rent 9 movies next month?

The function f(x)= 3^x was replaced with f(x)+k resulting in the function graphed to the right. What is the value of k?

Suppose the equation v=16.2x^2 - 192.1x + 2800 represents the value of a house from 1925 to 1950. When did the house have the lowest value? Round to the nearest whole number. (X=0 in 1925)

7.In one cycle, an engine burning a mixture of air and methanol (methyl alcohol) absorbs 525 J and expels 415 J. What is the engine’s efficiency?

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