exam Maths Puzzle Numerical Ability

i have no idea what i am doing. it is page 736 lesson 5-10 it is arithmetic and geometric sequences

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so like i earlly need help like alot so its

87 1/2 % of 32 A football is kicked into the air and follows the path defined by h=-2x^2+16x, where x is the time in seconds and h is the height in metres.What is the maximum height reached by the football?