$2.$Let Q$($x$,$y$)$ be the statement $$x$+$y $=$ x$-$y$.$ If the domains for x and y are all

integers, give the truth values of the following and explain why:

a$)$ Q$(1,1)$

b$)$xQ$($x$,2)$

$3.$Let F$($x$,$y$)$ be the predicate that x is a friend of y$.$ Express this English

statement in predicate logic:

a$)$ Everyone is a friend of themselves.