Chapter 5 - Number Theory and the Real Number System - 5.6 Exponents and Scientific Notation - Exercise Set 5.6 - Page 320: 100

$3 \times 10^3$

Convert each number to scientific notation to find: $=\dfrac{1.8 \times 10^{-3}}{6 \times 10^{-7}}$ Divide the corresponding parts to find: $=(1.8 \div 6) \times (10^{-3} \div 10^{-7}) \\=0.3 \times 10^{-3-(-7)} \\=0.3 \times 10^{-3+7} \\=0.3 \times 10^{4} \\=3 \times 10^{4-1} \\=3 \times 10^3$