Question

There are 7.5E38 stars in our Galaxy. So far astronomers have mapped 0.27% of all of these stars.

1) How many stars have been mapped in our sky?

Write answer like this example "5.23E45". Round to three significant digits, "5.23"​

Answer 1

2.03E36

Explanation:

The number mapped is the product of the total number and the fraction that are mapped:

7.5E38 × .27E-2 = 7.5×.27 E (38 -2) = 2.025E36 ≈ 2.03E36