exam Maths Puzzle Numerical Ability

2) Is (sqrtx)^2=x an identity (true for all nonnegative values of x)?
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exam Other Question

Find the area of the triangle with base b and height h.
b=y+1, h=2y

I have already used the formula a=1/2 bh and get confused because it is not a whole number but rather y+1. The book gives no example of such a problem. The perimeter of a rectangle is 96 inches. The length exceeds the width by 2 inches. Find the length and width.