book Maths Puzzle Numerical Ability

When you use text-based communication, how do I interpert the expression sqrt xy + 9? What is xy + 9 if x=7 and y = 4

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A rock is thrown from the top of a tall building. The distance in feet between the rock and the ground t seconds after it is thrown is given by d = -16t^2-2t = 524. How long afte Please help me solve this problem. -7i+6i
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9-4i