II. ARITHMETIC MEANS: Insert the indicated number of arithmetic means between the given the first and last terms of an arithmetic sequence. 1. -9,_, _, _, _, _,15 2. 21,_, _, _, _, 34 3. 8,_, _,_,64 4. 3_, _, _, 67 5.-12_,_,_,36 6.4_,_,_,5 7. -6_,_,_,-4
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