(7b^2 + 3b^4) + (2b^2 + 4b^3) + (8b^3 + 6b^4 + 9b^2)

(18b^2 + 9b^4) + (12b^3)

Step-by-step explanation:

(7b^2 + 3b^4) + (2b^2 + 4b^3) + (8b^3 + 6b^4 + 9b^2)

(9b^2 + 3b^4) + (4b^3) + (8b^3 + 6b^4 + 9b^2)

  (18b^2 + 3b^4) + (4b^3) + (8b^3 + 6b^4)

   (18b^2 + 9b^4) + (4b^3) + (8b^3)

    (18b^2 + 9b^4) + (12b^3)

i dont know men

step-by-step explanation:

i would say true? if the unit was informational and it "refreshed your understanding", then true.