Question

Astronomers measure large distances in light-years. One light-year is the distance that light can travel in one year, or approximately 5.88 x 1012 miles. Suppose a star is 1.23 x 102 light-years from Earth. In scientific notation, approximately how many miles is it?

12.3 x 10^12
7.23 x 10^13
7.23 x 10^14
5.88 x 10^12

Answer 1

7.23 x 10^14
your want you answer in miles ... therefore you multiply 1.23 x 10^2 by 5.88 x 10^12