39. [-/7 Points] DETAILS SCOLALG5 3.7.075.MI. MY NOTES For his services, a private investigator requires a $750 retention fee plus $95 per hour. Let x represent the number of hours the investigator spends working on a case. (a) Find a function f that models the investigator's fee as a function of X. f ( x ) = (b) Find f-1(x). f - 1 (x) = (c) Find f-1(2555). f-1(2555) = (d) What do the answers to (b) and (c) represent? ---Select