How many 2/5 are in 1

I'm so close to finishing all these.

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

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet