Step-by-step explanation:

- In the line 2, only variables were operated with a reduction of similar terms in each side of the equation, giving as result -4x at one side, and 2x at the other side.
- In the line 3, terms with variables were joined together in one side of the equation, and then, they were operate it, given as result -6X.
Volume = (1/3) * base area * height
= 1/3 * 24 * 18
= 144 ft^3
The answer to the question is 9/45, 8/40
The tank can hold 31.8 gallons of water.