Would appreciate if someone answers this, will give 75 points!

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

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.

Ineed in figuring out this problem.