a. 8.06 X 10^8
The decimal place is moved eight places to the right to get 8.06 so 10 is put to the power of eight. If it were put to the power of -8 the number would be smaller (0.0000000806). If you put 10^8 in a calculator and multiply it by 8.06 you will get the original number of 806,000,000