Question

Qual ébo decimo quinto termo da P.A (4,10,...) ?

Answer 1

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

Answer 2

an = a1 + ( n - 1 ) . r
a15 = 4 + ( 15 - 1 ) . 6
a15 = 4 + 14 . 6
a15 = 4 + 84
a15 = 88