exam Maths Puzzle Numerical Ability

Please show me how to solve this equation.
3y^2+16y=35

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exam Other Question

Please i need help with this problem:

The water level of a swimming pool, 75 feet by 42 feet, is to be raised 4 inches. The number of gallons of water needed for this purpose is....
(1 cubic foot equals 7 1/2 gallons) 4x - 5 (3x + 10) = 126
Please help with solving..need breakdown to solve other equations like this one. Thank you!