If we multiply 8.8 * 8 we get 70.4. We have to put that into scientific notation, which is 7.04 × 10^1. Now what we have is (7.04 × 10^1)(10^12). Our bases are 10's and as long as they are like, we will add the exponents. This final answer then is 7.04 × 10^13, choice D.