The slope of this problem is 3/4 same as the rate of change
The answer to 84 divided by 4=21.
Answer: THIRD OPTION.
Step-by-step explanation:
The Associative property of addition states that when three or more numbers are added, it does not matter how they are grouped, the sum is the same. Then:

Based on this and having the expression
, we can apply the Associative property as following:

Therefore, the expression that illustrates the Associative property of addition is the one shown in the Third option.
I'm not to sure but i think it's 15. this question is worded weirdly
You could use a calculator, or do mental math.