Question

the distance in kilometers to proxima centauri, the closest star to earth, is 39,900,000,000,000. estimate the distance in kilometers to proxima centauri by writing it in scientific notation. x 10

Explanation:

Step1: Move decimal point

Move the decimal point in 3990000000000. to the left until there is only one non - zero digit to the left of the decimal point. We get 3.99.

Step2: Count decimal places moved

We moved the decimal point 12 places to the left.

Answer:

3.99 x 10^{12}