What’s the 84th term of the arithmetic sequence -5, 15, 35

asked Sep 9, 2021 83.1k views

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Answer:

Explanation:

15-(-5) = 20 and 35-15=20 so d=20

$a_n=a_1+d(n-1)\\\\a_1=-5\\d=20\\\\a_(84)=-5+20(84-1)=-5+20\cdot83=-5+1660=1655$

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