Question

Gross domestic product (GDP) is a measure of the economic output of a country. The GDP of the United States was about 1.2 x 10^13 dollars in 2005. This is about 3 times the GDP in 1985. What was the U.S. GDP in 1985?

4 x 10^2
4 x 10^3
4 x 10^12
4 x 10^13

Answer 1

1. 7.08 x 10 ^ - 8

2. 6.1 x 10 ^ - 7

3. 1. 25 x 10 ^ - 4

4. Doubling n results in a doubling of the value of the expression.

5. 2.45 x 10^5

6. 4 x 10^12

7. 3 x 10^3

Answer 2

4 x 10^12 is the answer.

When you do 1.2 x 10^13, you get 12000000000000. Then you divide by 3 because in 1985 the GDP was 3 times less. Then, you get 4000000000000.
4 x 10^12 is equal to 4000000000000. There is the answer.