For the first three you need to find volume, so the formula for volume is b*w*h. base*width*hight. so multiply all three numbers together and you will find your answer.
In question 13 you must find the volume of the prism in 1/6 in. There are 13 1/6in in 2 1/6in, 7 1/6in in 1 1/6in, and 6 in 1in, so you multiply 13 * 7 * 6 = 546