beevus6258 beevus6258
  • 03-10-2018
  • Mathematics
contestada

If an = n(n+2), what is a9?


20


99


108


120

Respuesta :

Kamikazeminem
Kamikazeminem Kamikazeminem
  • 03-10-2018
[tex]a_{n} = n(n + 2) \\ a_{9} = 9(9 + 2) = 99[/tex]
Answer Link
Tucon
Tucon Tucon
  • 03-10-2018

 

an = n(n+2)

⇒  a9 = 9(9+2) = 9 × 11 = 99

Answer Link

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