In x times 9 = 81 what is x?

P. S Anime is silly

P. S.S I know the answer

Based on what i know about mean, this doesn't add up.

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

The graph shows the charges for a health club in a month. make a function table for the input-output values. writes an equation that can be used to find the total charge y for the number of x classes