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

Simplify the expression, and combine like terms.
- (-5m + 3n - 4p) if two angles are supplementary and one angle is 3 less than five times the oter angle, find the measure of the two angles.
write an equation and solve it to find the angles.

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