exam Maths Puzzle Numerical Ability

I need to know the radius and center for this equation. It is for cirles.
4x^2+75x-35y+4y^2=0

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exam Other Question

Write the factors for each of the following numbers. 48, 72, 93 and 126. hi how are you? please help to find the measure of angle 3 and measure of angle 5, if the M of angle 3=(x+20)o and M OF ANGLE 5 =X.