exam Maths Puzzle Numerical Ability

With these equations: z=x-y+4, z=y-w-3, and z=w-x+5 , what is the value of z?

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exam Other Question

perimeter of a rectangle = 230 what are the demensions if the length is 5ft less than 2x the width Use the binomial theorem to expand the binomial:

(3x^2-1/2square root of y)^4