Positive correlation.
Zero is x increases y stays the same
Negative is both decrease
The given set is {-1,0,1,2,3,4,5}
(notice the -2 and 6 are excluded)
the subset which contain positive factors of 5 is {1,5}
so the complement set would be
{-1,0,2,3,4) which matches with b)
25 times a letter Y = a number 5