5.2*10^7/2*10^-4
If this is the problem: (5.2 x 10^7) / (2 x 10^-4)
then the answer is 2.6 x 10^11.
5.2 ÷ 2 = 2.6
10^7 ÷ 10^-4 = 10^(7 - -4) = 10^(7 + 4) = 10^11 (when you divide two numbers with the same base, subtract their exponents)
This is 2600