Express in scientific notation. Choose the answer with the proper number of significant figures.

Question

69,000,000,000 = _____

69 x 109

6.9 x 1010

6.910

It has to be A, but I'm not exactly sure.

Answer 1

the format is to always have a single non-zero digit, followed by a decimal place time a power of 10

69,000,000,000
= 6.9 x 10^10 , exponent is 10 since we moved our decimal 10 places

Answer 2

oh, thank you that really helped. :)

Answer 3

210.000,000,000