exam Maths Puzzle Numerical Ability

In a rectangular coordinate system, the center of a circle has coordinates (5,12), and the circle touches the x-axis at one point only. What is the radius of the circle?

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what is the absolute value of [ 2x-8] = 0
(the brakets are the absolute value symbols) The force neeed to keep a car from skidding on a curve varies jointly as the weight of the car and the square of the car's speed, and inversely as the radius of the curve. If a fo