exam Maths Puzzle Numerical Ability

Find the center and radius of the circle whose equation is given.
5x2 + 5y2 + 40x + 115 = 40y

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exam Other Question

subtract and simplify please show all steps:2/(x=1)-3/(x-3) Factor the trinomial. Factor out all common monomials first.

9 x 3 - 9 x 2 + 2 x.