Question

Determine o quinto termo da P.A. A) a1=3 e r=4 B) a1=6 e r=-4 C) a=1 e r=π

Answer 1

A)

$a_n=a_m+(n-m).r\\\\a_5=a_1+(5-1).4\\\\a_5=3+16\\\\a_5=19$

B)

$a_n=a_m+(n-m).r\\\\a_5=a_1+(5-1).(-4)\\\\a_5=6-16\\\\a_5=-10$

C)

$a_n=a_m+(n-m).r\\\\a_5=a_1+(5-1).\pi\\\\a_5=1-4\pi$