exam Maths Puzzle Numerical Ability

simplify the radical: 1352

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need help..The altitude in feet of a projectile t seconds after launch is given by the function s(t)=-16t^2+32t+3. How long after launch will it take for the projectile to reach its maximum height? What is the maximum height?
thanks for your help Decide whether the values of the variables listed are solutions of the system of equations.

3x + 3y + 2z = 4
x - y - z = 0
2y - 3z = -8

x= 1, y= -1, z= 2