## Intermediate Algebra (6th Edition)

$11.9y^{2}+3.4y+3.9$
We are asked to add $(9.3y^{2}-y+12.8)+(2.6y^{2}+4.4y-8.9)$. We can combine like terms to add. $(9.3y^{2}+2.6y^{2})+(-y+4.4y)+(12.8-8.9)=11.9y^{2}+3.4y+3.9$