Prove Each Directly.
1. The product of any two even integers is even.

Prove by cases, where n is an arbitrary integer and Ixl denotes the absolute
value of x.
2. [-x]=[x] (*Brackets are the x's is the absolute value symbol)

Give a counterexample to disprove each statement, where P(x) denotes an
arbitrary predicate.
3. Every month has exactly 30 days.

Let a, b, and c be any real numbers. Then a < b if and only if there
is a positive real number x such that a + x - b. Use this fact to prove
each.
4. If a+c is less than b+c, then a is less than b

Determine if the given sets are equal.
5. {x, {y}}, {{x},y}

Let A = {a, e, f, g,i}, B = {b, d, e, g, h}, C = {d, e, f, h, i}, and U= {a,b,... ,k}.
Find each set.

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