The US postal service delivered 7.14 * 10 ^ 10 pieces of mail in the month of December and 3.21 x 10 ^ 10 in the month of January. What is the total mail delivered for these two months?
A 1.035 * 10 ^ 9
B 1.035 * 10 ^ 10
C 1.035 * 10 ^ - 10
D 1.035 * 10 ^ 11
E 10.35 * 10 ^ 11
The total mail delivered for December and January is calculated by adding the amount of mail delivered for each month:
7.14 * 10^10 + 3.21 * 10^10 = 10.35 * 10^10
Therefore, the total mail delivered for December and January is 1.035 * 10^11, which is option D.