Posted by **Shobhi** on Friday, November 11, 2011 at 8:09pm.

A star is 300 light years away from Earth. If the speed of light is 3 X 10^5 km/s, calculate the distance the star is from Earth. Give your answer in kilometers and written if standard form.

- Math -
**Reiny**, Friday, November 11, 2011 at 9:46pm
300(3 x 10^5)

= 900 x10^5

= 9.0 x 10^7

- Math -
**Reiny**, Friday, November 11, 2011 at 10:05pm
totally misread that question, sorry

300 years

= 300(365) days

= 300(365)(24) hours

= 300(365)(24)(3600) seconds

so distance

= 300(365)(24)(3600)(3 x 10^5) km

= 2.3824 x 10^16 km

- Math -
**Shobhi**, Saturday, November 12, 2011 at 9:24am
The question says 300 light years not 300 years

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