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Algebra
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It takes 3x10^ 7 years for a particular star to make one orbit around its Galaxy. Assume that this stars orbit in its Galaxy is circular with a diameter of 10^5 light years. There are about 5.859x10^12 miles in 1 light year. Estimate how many miles this star travels in one year.

Scientific notation and round to one decimal place if needed 

Oct 3rd, 2015

Thank you for the opportunity to help you with your question!

the star travel 2pi*10^5 lys, 

so it is 2pi*10^5*5.859 x10^12=3.681*1018 miles

 

Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 21st, 2015

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Oct 3rd, 2015
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Oct 3rd, 2015
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