Question 73865
a) to calculate log 10000 we can simply use a calculator. log 10000 translates to 
{{{10^x=10000}}} where the log is used to find x. So evaluating log 10000 we get 5. In other words, {{{10^5=10000}}}


b)
Since we know how to find log 10000, we can find {{{log (10000)/log (2)}}} Since log(10000)=5 we have our numerator and log(2)=0.301 so we divide them
{{{log (10000)/log (2)=5/0.301=16.61}}} If you don't know how to work your calculator you can look for a manual online or you can ask me.