book Maths Puzzle Numerical Ability

what is the prime factorization of 231

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A rock is propelled directly upward from ground level. After t seconds, it's height is given by f(t)=-16tsquared+256t (if air resistance is neglected). When will the rock return In rectangle WXYZ, diagonal WY=x-2 and diagonal XZ = the square root of x. Find x and the length of the diagonals of WXYZ.