A subset only includes element from the original set.
Answer #3 has "7" in it, but 7 isn't in Set A, so it cannot be a subset.
Weight goes 4 feet down before hitting the pool
therefor the pool is 12-4 ft or 8ft deep
(12)+(-4)=8 is the sum of integers
12 is an integer
-4 is an integer
Answer: 38
Step-by-step explanation: 27+11=38
The plus sign means that we have to sum all the terms inside of the second parenthesis, while the minus sign means that we have to change all the signs inside the last parenthesis:

Now we only have to gather all like terms:

Answer:19
Step-by-step explanation:
7x3=21
21-2=19