Which voting methods satisfy the Majority Fairness Criterion?

How do i work this problem out using the equation a=pe^rt

Kristen is wrapping presents for the holidays. she has a box that measures 4 ft. x 2 ft. x 2 ft. how many square feet of wrapping paper does she need to cover the box without overlapping?

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