Respuesta :

Answer:

It's 13.

Step-by-step explanation:

Average rate = [f(6) - f(3) ] / (6-3)

= [ (6^2 + 3(6) + 2 - (3^2 + 3(2) + 2) ] / 3

=  (56 - 17)/ 3

= 39 / 3

= 13 .