300
Each week Amber spends 10 hours doing her homework, 7 hours playing video games, and 9 hours playing outside. Write an expression that represents the total number of hours Amber spends doing homework, playing video games, and playing outside. Then, use the Associative Property of Addition to write an equivalent expression.
What is (10 + 9) + 7 and 9 + (10 + 7)