Answer:
2) is addition property
3) is multiplication property
Step-by-step explanation:
Answer: a =r-d - c
a+c =r-d
-c -c
a =r-d - c
1. y=7x
2. y=9x
12
The proper divisors of 12 are
1 2 3 4 6
Add those together you get 16
5