Question

Interpole 6 meios aritimeticos entre -15 e 6

Answer 1

$a1=-15\\ an=6\\ n=8\\ \\ an=a1+(n-1)r\\ 6=(-15)+(8-1)r\\ 6=(-15)+7r\\ 6+15=7r\\ 21=7r\\ \frac { 21 }{ 7 } =r\\ \\ 3=r\\ \\ P.A.\{ -15,-12,-9,-6,-3,0,3,6\}$