Answer
$4 \times 10^{15}$
Work Step by Step
Convert each number to scientific notation to find:
$=\dfrac{4.8 \times 10^{11}}{1.2 \times 10^{-4}}$
Divide the corresponding parts to find:
$=(4.8 \div 1.2) \times (10^{11} \div 10^{-4})
\\=4 \times 10^{11-(-4)}
\\=4 \times 10^{11+4}
\\=4 \times 10^{15}$
