Factor completely the expression X5-81x
A x(x4 -81)
B x(x2 +9)(x2-9)
C x(x + 3)'(x-3)
D x(x2 + 9)(x+3)(x - 3)

7x+8y=-18, 4x-9y=-3 solve the system of equations

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.

Abus travels 36 miles in 45 minutes. enter the number of miles the bus travels in 60 minutes at this rate.