find the arithmetic means in the sequence -28,...,...,...,...,7, 61,80,99, -1,3,7,0, 11,12,15, -1,2,5, -21,-14,-7,0, 6,9,12,0, find the arithmetic means in the sequence -4,...,...,...,8, 61,80,99, -1,3,7, 11,12,15, -1,2,5, -21,-14,-7, 6,9,12, find the sum of the arithmetic series n=19,an=154,d=8, 696, 2200, 1558, 90,300, 5885, 1668, find the sum of the arithmetic series 4+8+12+...+200, 800, 60.45, 1275, 4500, 1996, 5100.

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