The required quotient is:
[tex]\frac{8.4\times10^9}{8.4\times10^2}[/tex]To divide the numbers, first, divide the numbers which are not powers of 10, then divide the powers of 10 by subtracting the exponents:
[tex]\frac{8.4\times10^9}{8.4\times10^2}=(8.4\div8.4)\times10^{9-2}=1.0\times10^7[/tex]The required quotient in scientific notation is 1.0 X 10⁷.
