Question

A spacecraft travels 7,500,000 miles in one year. Express the distance in scientific notation.

Answer 1

scientific notation is written in the form

X * 10^(y) where X is a number at least 1, but less than 10
so, looking at 7,500,000 we can write this as

7.5 * 10^(exponent)
to determine that exponent, count the number of decimal places you have to move to get from 7,500,000. to 7.5. the exponent in this case is positive since 750,000 is greater than 1