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

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years

What is the radius of the cone in the diagram? round your answer to the nearest whole number