Answer
6.4985 $\times$ $10^{-8}$
Work Step by Step
Use the volume formula (V=$\pi$($r^{2}$h) and plug in the given values from the equation. The equation would be V=$\pi$($7.8 {\times}10^{-4}$$)^{2}$(3.4 $\times$ $10^{-2}$):
$\pi$($7.8^{2}$$\times$($10^{-4}$$)^{2}$)(3.4 $\times$ $10^{-2}$) -raise the terms in the parentheses to the power-
$\pi$(60.84$\times$($10^{-8}$)(3.4 $\times$ $10^{-2}$ -combine like bases and add the exponents-
3.14(206.856 $\times$ $10^{-10}$) -multiply-
649.85 $\times$ $10^{-10}$ -move the decimal two places to the left and add 2 to the power of -10 in order for it to be in scientific notation-
=6.4985 $\times$ $10^{-8}$
