exam Maths Puzzle Numerical Ability

Can you help me solve this problem: -2xsquared-5x-5
-(-5xsquared+3x-3)

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Simplify: (-4 + x2 + 2x3) - (-6 - x + 3x3) - (-6y3 + y2)
C-9 Automotive Trades- Total piston diplacement is given by the following formula
Whe. P.O.= piston diplacement in cubic inches
D= diameter of bore of cylinder
L=