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2 years ago

Please help me with this #6

Mathematics

1 answer:

kirza4 [7]2 years ago

8 0

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

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We are given the following in the question:

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