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 × 10n where 1 < a < 10 and is a one-digit number.(1 point)

Responses

3 × 10−9
3 times 10 superscript negative 9 baseline

3 × 109
3 times 10 superscript 9 baseline

3 × 10−8
3 times 10 superscript negative 8 baseline

3 × 108

actually that is the inverse, the speed

They asked for the time to go one meter
about 3 * 10^-9 second / meter

Apologies for the confusion. You are correct, the correct answer is:

3 × 10^-9

3 × 10^-8