Posted by **Skye** on Sunday, January 23, 2011 at 3:28pm.

The diameter of a car tire is approximately 0.6meters. The warranty is good for 70,000 km. About how many revolutions will the tire make before the warranty is up? More than a million? a billion?

----------------------- my work

c=pi*d

c=3.14*0.6

c=1.884 meters

1km=1000 meters

so 1.884 divided by 1000 = 0.001884 km?

So more than a billion revolutions? Is this correct?

- Geometry check my answer? -
**Damon**, Sunday, January 23, 2011 at 3:34pm
70,000 = 7*10^4 km *10^3 m/km = 7*10^7 meters

7*10^7 meters/1.884 meters/rev = 3.72*10^7 rev

37,200,000 revolutions

37 million and 200 thousand

- Geometry check my answer? -
**Skye**, Sunday, January 23, 2011 at 4:18pm
What does ^ mean?

- Geometry check my answer? -
**Damon**, Sunday, January 23, 2011 at 4:27pm
^ means exponent

2^2 = 2 to the 2 power or squared

2^3 = 8

2^4 = 16 etc

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