Question: Write an explicit formula for the following arithmetic sequence: 12, 21, 30, ... Question 7Select one: a. an=9n+3 b. an=12+4n c. an=n+9 d. an=an1+9

Write an explicit formula for the following arithmetic sequence: 12, 21, 30, ... Question 7Select one: a. an=9n+3 b. an=12+4n c. an=n+9 d. an=an1+9

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