# - Fee for Service For his services, a private investigator requires a \$500 retainer fee plus \$80 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. (b) Find f. What does f-' represent? (c) Find f'(1220). What does your answer represent?

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Calculus

### Functions

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- Fee for Service For his services, a private investigator requires a \$500 retainer fee plus \$80 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. (b) Find f. What does f-' represent? (c) Find f'(1220). What does your answer represent?