Arectangular prism has a length of 12 inches, a width of 5 inches, and a height of 4 1/4 inches. how many cubes are needed to fill the rectangular prism?

For each proportion find the unknown number x 1/5/8=×/15

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.

Could somebody me with this radical simplification?