28. 8x3=24 add four which gives you 28.
1 quart= 2 pints so 31 pints = 15.5 quarts so 15.5+13=23.5-20= 3.5 left hope this explains it better!!
The volume of this prism would be 294 cubic units.
To determine this you can use the given perimeter of 28 to create combinations of dimensions of a recatangule prism.
I started with 7 + 7 + 7 + 7 to get 28. This means the length and width were both 7 units.
This would make the dimensions of this prism 7 x 7 x 6(the height).
The find the volume multiply all three numbers.
The volume is 296 cubic units.
Notice the picture below
what we have, is really an angle, encroached by two sides
thus, use the Law of Cosines
I might be wrong but x should be -360