For a service call, a furnace technician charges an $85 initial fee, plus $50 for each hour he works. a) Write an equation represent the total cost, C dollars, for t hours of work.

b) If the repair takes 2 hours, how much will the customer be charged?

c) If a customer was charged $210, how long was the service call?

d) How would the equation change if the technician charges $95 initial fee plus $40 for each hour he works? Will the technician be making more for working 3 hours with this change?