What is the value of the expression 4 Superscript 4?

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

27 is what percent of 108? 27 is % of 108