Question

In scientific notation, the number 39,940,000,000 becomes A. 3.994 × 1010. B. 3.994 × 10–10. C. 39.94 × 109. D. 3994 × 107.

Answer 1

you need to move the decimal 10 places to the left to get it between the 3 and 9

 so it would be 3.994 x 10^10

Answer 2

39,940,000,000 = 3.994 x 10^10

answer

A. 3.994 × 10^10