exam Maths Puzzle Numerical Ability

find the center and the radius of the circle:
x2 + y2 - 12x-16y-21 =0

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exam Other Question

A car traveling 88km/h is passed by another car going the same direction at a constant speed. After 30 seconds the two cars are 600 meters apart. Find the speed of the second car. Subtract the following
6/7-1/10