exam Maths Puzzle Numerical Ability

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The price of an item is given by p = 2x squared - 100. Find the polynomial that represents the revenue generated from the sale of x items.

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Can you please help me? The problem is the square root of X squared to the third power equals 9. Can you show me how to work this out step by step? A lot is in the shape of a right triangle. The shorter leg measures 120 meters. The hypotenuse is 40 meters longer than the length of the longer leg. How long is the longer leg?