It may or it may not. Parity (whether the number is odd or even) has nothing to do with a sum of two odds being positive or negative.
-5 + 3 = -2 is negative, while 5 + 3 = 8 is positive.
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An even number
Yes.
An even number.
1+1=2
Any odd number can be written as an even number plus one. Any even number plus any other even number makes an even number. Add one makes an odd number. So an odd number plus an even number is always an odd number. Algebraically, any odd number can be written as 2a+ 1 where a is a whole number. Any even number can be written as 2b, where b is a whole number. Add them together, the sum is 2(a + b) + 1, which is odd.