B-8 would be the answer. This is because we are saying you have 8 less than something. So no matter what something is, we are taking away 8 from it. Since our something is unknown, we use our variable 'b' in its place, and subtract 8, giving us b-8.<span />
It’s 10/3 because 2/3 x 5 = 10/3
To do this multiply the three numbers together. 20 times 15 is 300 and 300 times 10 is 3,000. So the volume would be 3,000 feet cubed.