Yes
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1 1/4 and 1 3/4
When the sum of the negatives is an integer is when the sum is a whole number
yes 1.5 +.5 = 2 * * * * * No. 0.5 is NOT a mixed number. But 3.5 + (-1.5) = 2
No. A positive mixed number must be bigger than one: so each of them must be of the form one-and-some-more. Therefore, their sum must be two and the sum of two some-more bits, which must be more than 2.
Yes it can. Consider the numbers 31/2 and negative 11/2. Their sum is 2. So the question is misguided.