Speeding Fines Suppose that speeding fines are determined by y = 10(x − 65) + 50, x > 65, where y is the cost in dollars of the fine if a person is caught driving x miles per hour.
(a) How much is the fine for driving 76 mph?
(b) While balancing the checkbook, Johnny found a check that his wife Gwen had written to the Department of Motor Vehicles for a speeding fine. The check was written for $100. How fast was Gwen driving?
(c) At what whole-number speed are tickets first given?
(d) For what speeds is the fine greater than $200?
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