Question

What formula should I use to solve this? I don't want the answer just the formula.
There are six snakes in a valley. The population of snakes doubles every year. In how many years will there be 96 snakes?

Answer 1

solve \[6\times 2^n=96\] for n

Answer 2

divide by 6 get
\[2^n=16\] so
\[n=4\] because
\[2^4=16\]

Answer 3

to solve that, divide both sides by 6 and then take \[\log_2(n)\]
of both sides

\[n=\log_2(16)=4\log(2) = 4\]