I really need help im confuzzled

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.

How to do this , and can some one explain

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x