iselaevelyng123 iselaevelyng123

09-01-2018
Mathematics

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write a formula for this sequence: 8,-1,-10,-19

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altavistard altavistard

09-01-2018

This is an arith. sequence, and the common difference is -9.

a(n+1) = a(n)-9, with a(1)=8. Thus, if we look at the first term, we see 8; subracting 9 from 8 produces the second term (-1).

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