Question

find the 100th and nth term for the sequence 1,3,5,7...
I just need someone to explain how to do it, because my homework help isn't explaining it clear enough.

Answer 1

$a_{1}=1$
$a_{2}=3$
$a_{3}=5$
$a_{4}=7$
$a_{n}=2n-1$
$a_{100}=2(100)-1$
$a_{100}=200-1$
$a_{100}=199$