exam Maths Puzzle Numerical Ability

Please help me find the solution to this circumcenter problem. Find the coordinates of the circumcenter of Triangle ABC A(-2,2), B (3,1), C(-3,-1)

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exam Other Question

Find the mean.
1, 6, 10, 11, 12
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How much should be invested now at (i.e. fid the present value) 4% simple interest to have $4620 in 8 years?