Answer:
-28
Step-by-step explanation:
2(-2) is -4 and -24+-4 is -28 so yeah
Your answer, in your set notation, is
{-2, 7}
Answer:
16/15
Step-by-step explanation:

The two minus signs cancel, so the result is positive.
The answer to your question is yes
Answer:
E is not a subspace of 
Step-by-step explanation:
E is not a subspace of
In order to see this, we must find two points (a,b), (c,d) in E such that (a,b) + (c,d) is not in E.
Consider
(a,b) = (1,1)
(c,d) = (-1,-1)
It is easy to see that both (a,b) and (c,d) are in E since 1*1>0 and (1-)*(-1)>0.
But (a,b) + (c,d) = (1-1, 1-1) = (0,0)
and (0,0) is not in E.
By the way, it can be proved that in any vector space all sub spaces must have the vector zero.