book Maths Puzzle Numerical Ability

Please do you have a simple formula for finding the centre of a 2 dimensinal circle if I know 3 points on this circle?

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book Other Question

If the sales of a product increased by 8% in one year and by 15% in the next year, what was the overall percentage increase in sales over the two years? Solve the following inequalities:

a) x^3 < 8

b) x^3-x^2-9x+9 > 0

c) 2x^2-3x+1 / x+1 >0