Posted by **Help Please** on Friday, September 27, 2013 at 8:37am.

15. To travel a fixed distance, the number of gallons needed is inversely proportional to the miles per gallon rating P of the car that gets 42 miles per gallon (mpg) needs 33 gallons to travel the distance.

a. Find an equation of variation

N=

b. A car that gets 77 mpg needs _____ gallons of gas.

13. The number of instructions N performed per second by a computer varies directly as the speed S of the computer's internal processor. A processor with a speed of 20 megahertz can perforn 1,800,000 instructions per second.

a. Find an equation of variation

N=

b. The same processor perform _____ instructions if it is running at a speed 180 megahertz.

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