exam Maths Puzzle Numerical Ability

A circle whose center is at the point (1,2) passes through the point (4,-2). What is the length of the radius of the circle?

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exam Other Question

Mr. Turner invested a sum of money at 7% and twice that sum at 3%. His yearly return was $390. How much did Mr. Turner invest at each rate? 3x+y=5
-2x+3y+4