when 2x^3 + 3x^2+ax+b id divided by x-2 the remainder is 30, and when divided by x-3 the remainder is 83. Find a and b

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?