If the volume of a triangular prism is 432 with a width of 8 inches and a height of 6 inches what is

Volume is length times area. Area of a triangle is one half width times height.

v = l x (1/2) x w x h

432 = l x (1/2) x 8 x 6 = 24l

l = 432/24 = 18 <-- ANSWER