Question

Roughly, it takes light less than 0.000000003 of a second to travel a one-meter distance. Express this number in the form of a × 10^n
where 1 ≤ a < 10
and is a one-digit number.(1 point)
Responses

3 × 10^9

3 times 10 superscript 9 baseline

3 × 10^−8

3 times 10 superscript negative 8 baseline

3 × 10^8

3 times 10 superscript 8 baseline

3 × 10^−9

Answer 1

0.000000003 = 3 × 10^−9, because moving the decimal 9 places to the right gives 3 with exponent −9.