book Maths Puzzle Numerical Ability

simplify:

y-z/a+b times a^2-b^2/z-y

please do it step by step so I understand it

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book Other Question

Find the eccentricity of the ellipse given by 16x^2 + 25y^2=100 A city government has approved the construction of a $50 million sports arena. Up to $30 million will be raised by selling bonds that pay simple interest at a rate of 12% annually.