exam Maths Puzzle Numerical Ability

Rewrite the equation in slope-intercept form. 5x-2y-7=0

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can you help me with question?
this is from a hand out.
Find the center and radius of x^2+y^2-x+2y-3=0

I figured r=square root 17/2
and c=(0.5,-1) FIND THE TWO-HUNDREDTH DIGIT IN THE DECML REPRESENTATION OF EACH OF THE FOLLOWING FRACTIONS:
5/6
4/11
1/13