Question

1) Considerando a PA (4,7,10,13,...) calcule o a11. 2) Considerando a PA (0, 9, 18, 27,...) calcule o a17.​

Answer 1

1)

$an=a1+(n-1).r\\a11=4+(10).3\\a11=4+30\\a11=34$

2)

$a17=0+(16).9\\a17=16.9\\a17=144$