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
The unit rate is 5cm per 1min
5:1
Answer:
Distributive Property
Step-by-step explanation:
They distributed the -3 to x and 4. In this case, to distribute the -3, you multiply it to each term.
-3 × x = -3x.
-3 × 4 = -12.
-3x - 12
Answer:
129.3
Step-by-step explanation:
Well, this is a addition problem, the only thing you need to do is add
36.5 + 71.3 + 21.5
Hope it helps :D