The volume is 675 because when you multiply 20x15 you get 300 and when you multiply 25x15 you get 375. When you add 375+300 you get 675 as your volume.
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Solve for x.

Distribute the Parenthesis.


Combine Like Terms.

Add
1338 to both sides.

Subtract
668x from both sides.
![[(668x+900)+1338]-668x=[(672x-1338)+1338]-668x](https://tex.z-dn.net/?f=%5B%28668x%2B900%29%2B1338%5D-668x%3D%5B%28672x-1338%29%2B1338%5D-668x)
Simplify.


Divide both sides b
y
4.

Simplify.


Hope this helps.
-Benjamin
You will need the graph for this questions