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The function y = 15(x – 2) + 45 can be used to determine the total amount of money spent on a gym membership for x months. What is the rate of change of the total amount spent in dollars with respect to the number of months of gym membership?

2 answers

[This first step isn't entirely necessary.] Using the distributive property, the equation/function y = 15(x-2)+45 simplifies to y=15x+15. Therefore, the rate of change you're looking for is...

15.
extra credit: which 15 represents the rate of change?
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