For his services, a private investigator requires a $550 retainer fee plus $110 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. Rox) = (b) Find f-1. f-(x) = What does f represent? Ofi represents the amount in dollars paid for x numbers of hours of investigation. Of represents the amount in dollars paid beyond the retention fee for x numbers of hours of investigation. OF! represents the number of hours of investigation the investigator spends on a case for x dollars. Ofi represents the maximum number of hours of investigation the investigator will spend on a case. Of represents the amount paid per each hour of investigation. (c) Find f(2640). F(2640) = | What does your answer represent? OF (2640) represents the amount in dollars paid for 2640 hours of investigation. Of (2640) represents the amount in dollars paid beyond the retention fee for 2640 hours of investigation. OF (2640) represents the number of hours of investigation the investigator spends on a case for $2640. OF(2640) represents the maximum number of hours of investigation the investigator will spend on a case.