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May 29, 2015

Homework Help: math

Posted by invy on Monday, October 31, 2011 at 10:14pm.

a car travels at a constants speed and uses G(x) litres of gas per kilomotre, where x is the speed of the car in kilomotres oer hour and G(x)=(1280+x^2)/(320x)

a>if fuel costs 1.29 per litre, determine the cost function C(x)that expresses the cost of the fuel for a 200KM trip as a function of the speed.
b>what driving speed will make the cost of fuel equal to 300
c>what driving speed will minimize the cost of fuel for the trip?

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