Everything is all in one so every question needs to be answered reguardless of chegg guidelines.If ninZ, then $5n2+3n+7$ is odd. $($Try cases.$)$

If ninZ, then $n2+3n+4$ is even. $($Try cases.$)$

If two integers have the same parity, then their sum is even. $($Try cases.$)$

If two integers have opposite parity, then their product is even.