Answer
a. $3.18\times10^{12}$
b. $3.2\times10^{8}$
c. $9844$
Work Step by Step
a. A trillion can be written as $10^{12}$ and $3.18$ trillion can be expressed in scientific notation as $3.18\times10^{12}$
b. A million can be written as $10^{6}$ and $320=3.2\times10^2$ million can be expressed in scientific notation as $3.2\times10^{6+2}=3.2\times10^{8}$
c. Using division for the average, we have
$\frac{3.18\times10^{12}}{3.2\times10^{8}}\approx0.9938\times10^4\approx9938$ dollars per person.
