Question:
Which property was used to simplify the expression?
3c+9+4c=3c+4c+9
distributive property
commutative property
associative property
inverse property
Answer:
Commutative property of addition is used
Solution:
Given that,
3c + 9 + 4c = 3c + 4c + 9
We have to find the property used here
The property used is commutative property of addition
Definition:
Commutative property of addition means that numbers can be added in any order and we will still get the same answer
This means that,
a + b + c = a + c + b
It doesnt matter which is added first, we will still get the same answer
Therefore,
3c + 9 + 4c = 3c + 4c + 9
7c + 9 = 7c + 9
Thus commutative property of addition is used