Acircle has a diameter of 12 units and its center lies on the x-axis what could be the equation of the circle? check all that apply

Can someone show me step by step how to do this?

The patient recovery time from a particular surgical procedure is normally distributed with a mean of 5.2 days and a standard deviation of 1.7 days. what is the probability of spending more than 2 days in recovery? (round your answer to four decimal places.)

The graph shows the amount of total rainfall at each hour what was the total rainfall amount after three hours