exam Maths Puzzle Numerical Ability

How do I find the center and radius of this problem?
x^2+y^2+10x+7=0

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exam Other Question

For an examination there are 4 sections of questions with 100 marks each. Againt each section there are 5 levels for results . each level will add certain points . Please confirm h 3. Write the equation of the line with given slope and y-intercept. Then graph each line using the slope and y-intercept.



Slope: 5; y-intercept: (0, -2)