Question

im gonna leave this right here in case i need it later :)

Answer 1

at least we aint gonna stay on it too long; get to do sets next ... yay!!

Answer 2

mistake in number one i think

Answer 3

sum of two even integers: let m, n be even then
\[m=2j, n = 2k, m+n=2j+2k=2(j+k)\] is even

Answer 4

same idea for the second and third. start with m even then m = 2k
and likewise for third want to start "if n is odd then n = 2k - 1