exam Maths Puzzle Numerical Ability

Yah i know another icky work problem they always trip me up. can anyone plese assist me with this one. thank you
94. Demand for pools. Tropical pools sell an aboveground model

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exam Other Question

Find the Domain of the function:

(x^4 - 2x^2 +7)/ (3x^2 -10x -8) A triangle with sides of 15, 39, and 36 is revolved about the longest side, using it as an axis. What is the surface area and volume of the resulting shape?