Bryan cuts a piece of cardboard in the shape of a trapezoid. the area of the cutout is 43.5 square centimeters. if the bases are 6 centimeters and 8.5 centimeters long, what is the height of the trapezoid

trapezoid area = ((sum of the bases) ÷ 2) • height
height = trapezoid area / ((sum of the bases) ÷ 2)
height = 43.5 / ((6 + 8.5) / 2)
height = 43.5 / ((14.5) / 2)
height = 43.5 / (7.5)
height = 6 centimeters

Source:
http://www.1728.org/quadtrap.htm