Question

qual o decimo quinto termo ta PA (4,10...)

Answer 1

an=a1+(n-1).r a15=4+(15-1).6 a15=4+14.6 a15=4+84 a15=88

Answer 2

r = 10-4 = 6

$a_{15}=4+(15-1).6\\a_{15}=4+84\\a_{15}=84$