Gift box in the shape of a triangular prism has a volume of 140 cubic inches that a base height of 10 inches, and a height of 4 inches. What is the length of the base?

I got 7 in as the base

Step-by-step explanation:

The area of a triangle is 1/2*width*length. Volume of a triangular prism is 1/2*width*length*height.

Fill in and we get 1/2*10*length*4=140. length = (140*2) / (10*4) = 280/40=7. So you're right.