exam Maths Puzzle Numerical Ability

I really need help here. I need this answer like right now,
2) Is (sqrt x)^2=x an identity (true for all nonnegative values of x)? It is due in less than 30 min, please help me

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exam Other Question

determine the point A(x,y) so that the points A(x,y), B(0,3), C(1,0), D(7,2) will be the vertices of a parllelogram? 4. If f and g are linear functions with graphs that are perpendicular, show that the slopes of the graphs of f-g and g-f are both -1.