the base of a triangular sail is x feet and its height is 1/2x+7 feet.which expression represents the sails area?

Answer 1

A=bh/2 = x(x/2+7) / 2 = (x^2/2 + 7x)/2
= x^2/4 + 7x/2 = x^2/4 + 14x/4.