book Maths Puzzle Numerical Ability

graph the rational function

x^2 + x - 2/2x^2 + 1

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book Other Question

Write an equation of the circle whose center is at the origin and the point (3,-6) is on the circle.

I know the the formula to use is this:

(x-h)squared + (y-k)squared = r squared What is the measure of each angle of a regular polygon with 6 sides?