Question 986039
.
C=Total charge; n=number of sites; h=hours worked at all sites
.
C=$45n+$24h
.
For n=2 and C=$810:
$810=$45(2)+$24h
$810=$90+$24h
$720=$24h
30hrs=h
ANSWER: You must work a total of 30 hours at two sites to earn $810.