Question: Please show work 1) Write the explicit forme for Sequence 7, 2 ,- 3,-8 ,-13. find aty 21 How many multiples of 6 are between

Please show work

1) Write the explicit forme for Sequence 7, 2 ,- 3,-8 ,-13. find aty 21 How many multiples of 6 are between 40 and you? 3) Evaluate the arithmetic Series 50 a In+ 3 n = 3 (9 ) Sum of the geometric series 18, 6, 2 5 ) Write in Sigma notation 278+ 32+128
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