Question

1. Cuantos termos a P.A. (5, 9 , 13 , ... , 37 possui ?​

Answer 1

Resposta:

Explicação passo-a-passo:

$a_1=5\\a_n =37\\r=9-5=4\\\\\\a_n = a_1+(n-1)r\\37 = 5+(n-1)(4)\\37=5+4n-4\\37=4n+1\\4n=37-1\\4n=36\\n=\frac{36}{4}\\n = 9$