2. Which equation below illustrates the associative property of addition? (1) (2+8)+(1+9)= (8+2)+(9+1)
(3) 5+2(3+4) = 5 +6+8
(2) 5(2 + 7)=10+35
(4) (3+7+2 = 3+(7+2)

Cheryl works as a hotel maid. the number of hotel rooms she cleans is directly proportional to the number of hours she works. the graph shows that r rooms are cleaned in t hours. using the graph below answer the following questions under it