Question 4201
Dividing numbers with exponents. 

(5 X 10^-5) / (25 X 10^3)  You can do the integer part first:
  5/25 = 1/5 
Then do the exponential part:  10^-5 / 10^3  Dividing exponents means you have to subtract the exponents:  -5 -3 = -8  So 10^-5/10^3 = 10^-8

Generally, we like to see positive exponents in the answer, so 10^-8 = 1/10^8

The final answer is: (1/5)X10^-8 = 1/(5X10^8)

If you have to write the answer in "standard notation" (without exponents), then it would become:

  (1/5)X10^-8 = 0.2X10^-8 = 0.000000002