U decreased by 17 equals what

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

Can someone answer this question for me

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64