Question 276579
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There are 5280 feet in a statute mile.  So there are 5280 times 12 = 63360 inches in a mile.  If the tire makes 672 revolutions in 63360 inches, the circumference of the tire must be 63360 divided by 672 is approximately 94.29 inches.  The circumference of a circle (I hope your tire is a very good approximation of a circle -- otherwise you are in for a VERY bumpy ride) is given by 2 times *[tex \Large \pi] times the radius.  Therefore, the radius is the circumference divided by 2 times *[tex \Large \pi].  94.29 divided by *[tex \Large 2\pi] is very close to one of your answers.  You can do the rest of the arithmetic.


By the way, congratulations on being the recipient of my <b>6000th Algebra.com answer</b>.  You don't win anything, and neither do I, but I just wanted to commemorate the event.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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