exam Maths Puzzle Numerical Ability

Simplify (-2a^2 b^3)^2/(2a^2 b)^3

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exam Other Question

find the center and radius of the circle given by x(squared)- 4x + y(squared) -6y + 12 = 0 Let P = (-25,0), Q = (25,0), and R = (-24,0). Find an equation for the circle that goes through P, Q, and R. Find at least two ways of showing that angle PRQ is right, and find coordinates for the three other points R that would have made angle PRQ right.