Given f(x)=1/2x^2+10 what is f(4)

Ineed to know the answer to this algebra question.

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?

If two lines form congruent alternate interior angles with a transversal, then the lines