Acylinder has volume 45 and radius 3. What is its height?

What are the soultion(s) to the quadratic equation 40- x^2=0

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?

The answer is 7.2 how would you put this as money