Question 73935
a) log base 10 of 10000
Scientific Calculator: plug in 10000 log
TI83, 83+, or 84: plug in log 10000 
or by hand: 10^x = 10000
answer: 4

b) log base 2 of 10000
log b a = log base 10 of a / log base 10 b
b=2, a=10000
log 10000 / log 2
13.28771238
To round to the hundredth's place round at the second decimal place
13.29