10. An electrician charges $75 per visit plus
$25/h for house calls.

a) Write an algebraic expression that
describes the service charge for one
household visit.

b) Use your expression to find the total
service charge for a 3.5-h repair job.

c) Suppose all charges are double for
evenings, weekends, and holidays. Write
a simplified expression for these service
charges.

d) Use your simplified expression from part
to calculate the cost for a 3.5-h repair
job on the weekend. Does this answer
make sense?