Question

Qual o 8 termo da PA (23,18,13..)

Answer 1

$a_n=a_8=? \\ a_1=23 \\ n=8 \\ r=18-23=-5 \\ \\ termo~~geral \\ \\ a_n=a_1+(n-1)r \\ \\ a_8=23+(8-1)(-5) \\ a_8=23+(7)(-5) \\ a_8=23-35 \\ \\ a_8=-12$