Dan works at a hardware store. The employee discount is determined by the
formula d = 0.15 (c − 10 ). Use the inverse of this function to find the cost of the item for which Dan received an $18.00 discount.
a. Find the inverse function that models cost as a function of the discount.
b. Evaluate the inverse function for d = 18.
c. What was Dan’s final cost for this item?
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1 answer

I don't think you are using the concept of the "inverse of a function" in the proper way, you are just solving the equation for c
d = .15c  1.5
.15c = d + 1.5
c = (d+1.5)/.15
now plug in d = 18
c = (18+1.5)/.15 = 130
We could have just plugged in d = 18 in the original
18 =.15(c10)
18/.15 = c10
120 = c  10
130 = c 👍
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answered by Reiny
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