A plumber charges a flat fee of $78 to visit a home and examine a clogged drain

Question

A plumber charges a flat fee of $78 to visit a home and examine a clogged drain. The plumber charges an additional $26 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+26h78

Answer the following questions.

(a)		What is the total cost for fixing a drain that takes 7	hours?
$
(b)		If the plumber charged a total of $390	, how many hours did she spend fixing the drain?
	hours

Answer 1

C = 78 +26h

for 7 hours C= 78+26(7) = 78+182 = $260

if C= 390 = 78+26h

26h = 390-78= 312

h = 312/26 = 12 hours