David hires a septic system contractor to dig trenches for his new septic tank. The cost to hire the contractor is a fixed cost of $150 plus an additional $80 per hour. Which expression below describes the average cost of an x-hour job?

Question

Quizplus · Accepted Answer

The expression for the average cost of an x-hour job can be written as:
Total cost for x hours / x
= (150 + 80x) / x
Simplifying:
= 150/x + 80
= 80 + 150/x
So, the average cost of an x-hour job is a function of x, and is equal to a fixed cost of $80 plus a variable cost of $150/x. Therefore, the correct expression for the average cost is 11ea9079_e2a6_666b_aec7_bbbc02bf66ff_TB3543_11.

David Hires a Septic System Contractor to Dig Trenches for His