Modeling with Rational Functions

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Craig bought a treadmill for $400. He estimates that the annual costs to maintain the machine will be $36. Which rational function yields the average annual cost in dollars of owning the treadmill for x years?

Sep 30th, 2015

Hello!

The average annual cost is the quantity of dollars spent  divided by the number of years.

The number of years denoted as x.
The quantity of dollars is 400 from the initial purchase plus 36 for every year,
400 + 36*x.

The average is (400+36*x)/x = 400/x + 36. This function is really rational.

Please ask if something is unclear.
Sep 30th, 2015

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Sep 30th, 2015
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Sep 30th, 2015
Sep 22nd, 2017
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