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April 19, 2014

Homework Help: math

Posted by kathy m. on Sunday, December 30, 2012 at 9:46pm.

Suppose that a certain municipality uses the equation y=3(x-50)+30 to determine the fine assessed a car which exceeds the 50 mph speed limit. Let x=speed of the car (in mph) and y=corresponding fine in dollars.

a)What is the fine for traveling at 55 mph?

b)If the fine is $126, what is the speed of the car?

c)If car A travels at 60 mph and car B travels at 90 mph, then car B is traveling 50% faster than car A. However the fine for car B is what percent higher than that of car A?

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