- 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
(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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