Please help me! Thank you! Usually I can do stuff like this by my brain just went *splattt*

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.

Acircle has a circumference of 28.36 units what is the diameter of the circle

Find the value of x. give reasons to justify your solutions! l, m ∈ kn