Here is how to solve it with long division and synthetic division.
Answer:
what is the question ? Volume or surface area???
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➷ 3x + 1 = 511
Subtract 1 from both sides:
3x = 510
Divide both sides by 3:
x = 170
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Notice the picture below
the added water, will also be a rectangular prism, with a height of 2.5cm