Respuesta :
The total cost for the repair is expressed as f(h) = 30h + 60 where h is the number of hours worked. We are given the total cost which will allow us to calculate the number of hours worked. We calculate as follows:
f(h) = 30h + 60
150 = 30h + 60
90 = 30h
h = 3 hours -------->OPTION 2.
f(h) = 30h + 60
150 = 30h + 60
90 = 30h
h = 3 hours -------->OPTION 2.