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Second one is me lol

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Answer this question! 30 points and brainliest! only if you know the answer.

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is