Question

Dada a P.A. (33, 37, 41, ...) determine:
a) oitavo termo
b) vigésimo termo

Answer 1

E aí mano,

sendo:

$a_1=33\\ r=a_2-a_1~\to~r=37-33~\to~r=4$

Podemos expressar:

$a_8=a_1+7r\\ a_8=33+7\cdot4\\ a_8=33+28\\\\ \large\boxed{\boxed{a_8=61}}\\\\\\ a_{20}=a_1+19r\\ a_{20}=33+19\cdot4\\ a_{20}=33+76\\\\ \large\boxed{\boxed{a_{20}=109}}\\.$

ótimos estudos mano!