exam Maths Puzzle Numerical Ability

An angle has measure x(degrees). Find the average of the measures f a complement and a supplement of the angle.

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exam Other Question

The perimeter of a rectangle is 68cm. The length is 4cm more than the width. Fine the dimention of the rectangle. We are familiar with the identity (a+b)(a-b)=a^2-b^2. If A and B are n*n matrices, do we always have (A+B)(A-B)=A^2-B^2? If so, prove it. If not, give a counterexample, and give a