To solve this question, first we multiply.
Before anything else, we must find the area of the triangle on either side of the prism. The measurements are 24 in. by 7 in., so we do that, which gives us 168 in.²
Then, we multiply this by the base length, which is 20 in.
168x20=3360, so the correct answer is B, 3,360 in³.
Hope I helped!
