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A. Find the indicated term for each sequence.

1) Find the 30th term of the arithmetic sequence 9, 12, 15, 18,...

2) Find the 27th term of the arithmetic sequence 7,11,15,...

3) Find the 18th of the arithmetic sequence -12,-8,-4,-..


B. Find the sum of the first:

1) 40 terms of the arithmetic sequence if the first term is 21 and the twentieth term is 154.

2) 25 terms of the arithmetic sequence whose general term is an = 12 + 7n.