## Thinking Mathematically (6th Edition)

$4 \times 10^{15}$
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: $=(4.8 \div 1.2) \times (10^{11} \div 10^{-4}) \\=4 \times 10^{11-(-4)} \\=4 \times 10^{11+4} \\=4 \times 10^{15}$