Question

Dada a P.A.(4,7,10,...) encontre o decimo segundo termo

Answer 1

$r=10-7=7-4=3$
$a1=4$

$an=a1+(n-1)r$
$a12=4+(12-1)*3$
$a12=4+11*3$
$a12=4+33$
$a12=47$