Question

Write 82,000,000 in scientific notation.
A. 8.2 x 107
B. 82.2 x 107
C. 8.2 x 108
D. 8.2 x 109

Answer 1

I believe the answer is A, as long at that 107 is 10 to the 7th power. :)

Answer 2

A.  $8.2*10^{7}$

Put the decimal between the first two significant figures (in this case, 8 and 2).  Then count how many times you have to move it to the right to get to the end of the original number, that's your exponent.