Respuesta :

Answer:

-21.6 z^3 - 2 z + 2

Step-by-step explanation:

(-12.7z³ - 14z) + (-8.9z³ + 12z + 2)

I like to line them up vertically

  (-12.7z³ - 14z)

+ (-8.9z³ + 12z + 2)

---------------------------------

-21.6 z^3 - 2 z + 2