Question

Quero saber o 6°termo cada PA
an=a1+(n-1)r

(15,13.11...)

Answer 1

$a_{n} = a_{1} + ( n - 1) . r$


$a_{6} = 15 + 5 . (-2)$


$a_{6} = 15 - 10$


$a_{6} = 5$