book Maths Puzzle Numerical Ability

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

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there are two solutions for the equation {{{bx^2-cx*a^2+0}}} (where a,b,and c are constants, and x is the unknown). They differ by the sign of the square root. Enter the the on wit 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