When solving these proportions we just remember when moving a number from one side to the other if it started in the numerator it ends up in the denominator and vice versa.
I'll do it in two steps here for teaching purposes; it's not too hard to go directly to the answer.
D as you can see on the number line d is 1/3 of the way to -2
answer = 2
You can just use a calculator unless you need to show your work
Carl needs to find the (B) Volume of the fish tank
Hope this helped!!