Question 144386
{{{(8*10^(-4))/(4*10^8)}}} Start with the given expression
 


{{{(2*10^(-4))/(10^8)}}} Divide {{{8/4}}} to get 2. 



{{{2*10^(-4-8)}}} Subtract the exponents



{{{2*10^(-12)}}} Subtract



{{{2/10^(12)}}} Flip the fraction to make the exponent positive



So {{{(8*10^(-4))/(4*10^8)=2/10^(12)}}}