exam Maths Puzzle Numerical Ability

Identify the center and radius of the circle x^2+y^2-2x+4y-6=0

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Could someone help me answer this probabilities and statistics question?
How many paths can a rook move from the lower left corner of a chessboard to the diagonally opposite corne

The official record for swimming the English Channel, a distance of 18 miles, is held by Penny Dean, who completed her swim in 7 hrs 40 minutes What was her average speed, in miles per hour?