Question: In Exercises 1-4, write the equation of the circle in standard form, and then find its center and radius. 1. x2 + y2 8y

In Exercises 1-4, write the equation of the circle in standard form, and then find its center and radius.
1. x2 + y2 − 8y = 0
2. x2 + y2 − 10x + 16 = 0
3. x2 + y2 − 2x + 6y + 9 = 0
4. 2x2 + 2y2 − 2x − 2y − 7 = 0

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