Answer:
0
Step-by-step explanation:
It may say combine, but it`s subtraction soooo it`s 0.
Associative Property of Addition hope this helps
Answer:
12y+6
Step-by-step explanation:
You have to use the distributive property and do 3 x 4y and 3 x 2 and you get 12y+6.
Answer:

Step-by-step explanation:
Step 1: Write out limit

Step 2: Evaluate
(2 + 1)(3(2)² - 9)
3(3(4) - 9)
3(12 - 9)
3(3)
9
Answer:
6 1/2 hours
Step-by-step explanation:
not sure