Answer
$SA_{Mars}$=1.45 $\times$ $10^{8}$ square kilometers.
Work Step by Step
Use the equation from the problem and the radius:
$SA_{mars}$=4$\pi$(3.4$\times$$10^{3}$$)^{2}$.
$SA^{mars}$=115.26 $\times$ $10^{6}$ -distribute the power 2 to the terms inside the parentheses-
$SA_{Mars}$=1.45 $\times$ $10^{8}$
