Question

qual e o vigésimo termo da p.a (130,137,144...)

Answer 1

an=a1+(n-1)r
a20 = 130+(19)7
a20 = 263

Answer 2

An: ?
n: 20
r: 7
a1: 130

Fórmula:

an = a1 + (n -1) . r

an = 130 + (20-1) . 7

an = 130 + 19 . 7

an = 130 + 133

an = 263