book Maths Puzzle Numerical Ability

What is the formula for finding the radius of an arch when only 3 points on the arcs are known in terms of x and y cordinates? Also requires little explaination

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book Other Question

x^3 +9x^2+14x/x^2-4 solve using the calculator.

3x+2y=3
y=(3/2)x-(1/2)

(3/2)and(1/2) are shown as fractions out of paranthesis on my paper.