Someone i'm so confused, does anyone know these answers?

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

Find y to the nearest hundreds place

Nour and rana are shopping for a christmas tree. they are deciding between 2 22 different types of trees (real and fake) and 4 44 colors for the ornaments (white, silver, gold, and purple). they each created a display to represent the sample space of randomly picking a type of tree and a color for the ornaments. whose display correctly represents the sample space?