Question

Sandra is selling brownies to save money for the French Club. The equation f (x)=0.5x-10 represents her profit, f(x), for selling x brownies. Which statement is true about the value of f(78)

A. the value f(78)=29 and it represents a profit of 29 dollars after selling 78 brownies
B the value f(78)=29 and it represents a profit of 78 dollars after selling 29 brownies
C The value f(78)=49 and it represents a profit of 49 dollars after selling 78 brownies
D the value f(78)=49 and it represents a profit of 78 dollars after selling 49 brownies

Answer 1

D

Explanation:

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Answer 2

A

Explanation:

First let’s substitute x for 78.

0.5*78-10=39-10=29

So for selling 78 brownies she earned $29.00