Let f be a function that gives the cost to rent a power washer for x hours. The cost is a flat $45 for renting the washer, plus $20 per day or fraction of a day for using the washer.
(a) Graph f .
(b) Give the domain and range of f .
(c) John McDonough wants to rent the washer, but he can spend no more than $90. What is the maximum number of days he can use it?
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