Please help me with this #6

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asked May 13, 2023 83.2k views

22 votes

Please help me with this #6

Mathematics
high-school

Keith Hall asked

by Keith Hall

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1 Answer

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$\text{First term,}~ a = 4,\\\\\text{Common difference,}~ d = 9-4 = 5\\\\\text{Nth term} = a + (n-1) d\\\\~~~~~~~~~~~~~=4+(n-1)5\\\\~~~~~~~~~~~~~= 4+5n-5\\\\~~~~~~~~~~~~~= 5n-1\\\\\text{Hence. 80th term}~ = 5(80) -1 = 399$

Verystrongjoe answered May 18, 2023

by Verystrongjoe

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