For the answer to the question above, I'll do it step by step so you could follow.Explanation:
Use Change of Base Formula
logb m = loga m/loga b
Then substitute the values
log2 74 =log10 74 / log10 2
In the calculator Just type
log 74 / log2
And the answer should be
6.2094533656
I hope i helped you with my answer.