Please someone help me answer this!!

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

What does the relationship between the mean and median reveal about the shape of the data

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%