A city has two water towers. One tower holds 4.37 x 106 gallons of water and the other holds 3.92 x 106 gallons of water. What is the combined water capacity of the two towers?
17.13 x 1012 gallons
17.13 x 1012 gallons
1.11 x 100 gallons
1.11 x 100 gallons
8.29 x 106 gallons
8.29 x 106 gallons
.45 x 1012