book Maths Puzzle Numerical Ability

simplify each expression

9ab+8ab-7ab

how do i do this

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please do this for me3/9z+8=12 A ball is thrown downward from a window in a tall building. Its position at time t in seconds is s=16t^2(32t), where s is in feet. How long (to the nearest 10th) will it take the b