## Algebra 1

$11r^3+11$
We start with the given expression: $(5r^3+8)+(6r^3+3)$ We remove the parentheses using the distributive property: $5r^3+8+6r^3+3$ We use the commutative and associative properties of addition to group like terms: $(5r^3+6r^3)+(8+3)$ We add like terms: $11r^3+11$