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Question

The equation C= 40x+25 gives the cost, to hire a plumber for x hours.

a. What is the cost for 4 hours?

b. If the cost is $265, for how many hours did the plumber work?

Answer 1

Hi there!

This problem tells us the "x" stands for hours. For the first question, we are going to substitute 4 in for x:

40(4) + 25

160 + 25

185 This is our total cost.

For the second part, they give us the total cost and we need to solve for the number of hours, "x":

265 = 40x + 25

-25 -25

240 / 40 = 40x / 40

6 = x So the number of hours is 6.

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