Chapter 5 - Section 5.4 - Adding and Subtracting Polynomials - Exercise Set - Page 371: 10

$10.7y^{3}+2.7y^{2}-8.8y+3$

$(9.6y^{3}+2.7y^{2}-8.6)+(1.1y^{3}-8.8y+11.6)$ Remove both parentheses: $9.6y^{3}+2.7y^{2}-8.6+1.1y^{3}-8.8y+11.6=...$ Simplify by combining like terms: $...=(9.6+1.1)y^{3}+2.7y^{2}-8.8y+(11.6-8.6)=...$ $...=10.7y^{3}+2.7y^{2}-8.8y+3$