Question: Let a1, a2, a3,..., an,... be an arithmetic sequence. In Problems 9-14, find the indicated quantities 10. a1 = - 2; d = -3 ;

Let a1, a2, a3,..., an,... be an arithmetic sequence. In Problems 9-14, find the indicated quantities
10. a1 = - 2; d = -3 ; a2 = ?; a3 = ?
12. a1 = 8; d = - 10;a15 = ?;S23 = ?
14. a1 = 203; a30 = 261; S30 = ?

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