1. 4+7=7+4
2. 9+5+3=3+5+9
3. 5(7+1)=35+3
4. (1+2)+3=1+(2+3)
5. 6(a-3)=6a-18
6. (9+5)+4=5+(4+9)
A. Associative Prop of Addition
B. Associative Prop of Multiplication
C. Commutative Prop of Addition
D. Commutative Prop of Multiplication
E. Distributive Prop
1.A
2.C
3.E
4.A
5.E
6.A
2.
When you see inversion of the operands, it indicates that it uses the "commutative" property.
So take another look at 1.
The rest are OK.
Note:
3) should read:
3. 5(7+1)=35+5