Question

There are around 1.5×109 pet fish and 8.9×107 pet reptiles in the United States. How many fish and reptile pets in total are in the United States?

Answer 1

Explanation:

The exponents need to be the same in order to add these numbers

1.5 x 10^9 = 150 x 01^7

150 x 10^7 + 8.9 x 10^7 = ( 150 + 8.9) x 10^7 = 158.9 x 10^7 total

can also be written as 1.589 x 10^9 or 1 589 000 000