Which equations represent circles that have a diameter of 12 units and a center that lies on the y -axis? Choose two correct answers.

A circle with diameter 12 has radius 6, so the squared-radius value in its equation must be 36. Its center lies on the y-axis when the x-coordinate of the center is 0. Choice C has center (0, 3) and squared radius 36, while choice E has center (0, −8) and squared radius 36. Both meet the conditions.

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