Respuesta :

joshlind3

Answer:

The 8th number is -9

Step-by-step explanation:

With an average, the sum of the seven numbers divided by 7 is 15.

In order to add an 8th number, we set up

[tex]\frac{7*15+x}{8}=12\\105 + x = 96\\x = -9\\\\\frac{105-9}{8}=\frac{96}{8}=12[/tex]