What is the answer to this geometry answer?

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

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.

What number line represents the solution set for the inequality -1/2 greater than or equal to 4