exam Maths Puzzle Numerical Ability

what is the equation of the ellipse with foci at (0,-4)and (0,4)and the sum of its focal radii being 10

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exam Other Question

A farmer buys 100 live animals for $100. How many of each doe she buy if chicks are .10 each, pigs are 42 and sheep are $5 each? x varies directly as y and inversely as the square of z. If x=10 when y=8 and z=2, find x when y=12 and z=3.