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klemol [59]
3 years ago
15

If an = n(n+2), what is a9? 20 99 108 120

Mathematics
2 answers:
fomenos3 years ago
7 0

 

<h2>an = n(n+2)</h2><h2>⇒  a9 = 9(9+2) = 9 × 11 = 99</h2>
Sphinxa [80]3 years ago
3 0
a_{n} = n(n + 2) \\ a_{9} = 9(9 + 2) = 99
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