Question

Use the change of base formula to evaluate log4 20.

Answer 1

your calculator probably only evaluates in base 10 (ln is base e but we won't use that today)

so

`log_a(b)=(log_c(b))/(log_c(a))`
where c is the new base
so if you wanted in base 10

`log_4(20)=(log_(10)(20))/(log_(10)(4))`
using calculator, that is about 2.16096