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

\[ GDP_{1985} = \frac{1}{3} GDP_{2005} \]
\[ = \frac{1}{3} (1.2 \times 10^{13}) \]
\[ = \frac{1.2}{3} \times 10^{13} \]
\[ = 0.4 \times 10^{13} \]

Now which of the solutions is that equal to?

Answer 2

the bottom one thanks

Answer 3

No, that's not right.