book Maths Puzzle Numerical Ability

how do you solve this system of equation:
y=-2x^2+8x+27
2x+y=15

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book Other Question

I need help with subtracting radicals PLEASE!!!!!!
The problem is 5sqrt72-3sqrt48-4sqrt128= If 48 square inches are subtracted from the area of a square table, the result would be equal to twice the perimeter. What is the length of the side of the table?
______ feet long