Question

CALCULE QUANTOS TERMOS TEM A PA,SENDO A =5 E AN=-50 E R = 5 ?

Answer 1

Olá, Ladylipelangdon!

$an = a1 + (n-1) . r$

$-50 = 5 + (n-1) . 5$

$-50 = 5 + 5n - 5$

$-50 = 5n + 5 - 5$

$-50 = 5n$

$5n = -50$

$\boxed{n = \frac{-50}{5} = 10 \ termos}$