Question

A plumber charges a flat fee of $77 to visit a home and examine a clogged drain. The plumber charges an additional $21 per hour spent fixing the drain. The

total cost, C (in dollars), for fixing a drain that takes h hours is given by the following.
C=77+21h
Answer the following questions.
(a) What is the total cost for fixing a drain that takes 6 hours?

(b) If the plumber charged a total of $329, how many hours did she spend
fixing the drain?

Answer 1

(a) 77+21(6) = $203

(b) 329 = 77 + 21h means 252 = 21h, and thus h = 12 hours