Answer:
only the first two are correct (top to bottom)
Explanation:
For the first one, we know this because the the opposite of -3.5 is 3.5, and the rightside of zero is positive.
For the second one, we know the expression, -(-3.5) is equal to 3.5 because whenever there is a minus before a parentheses and there's a minus sign inside of the parentheses it automatically becomes positive.
For the third one, we know it's incorrect because the opposite of a positive is a negative.
Lastly, for the last one, (the most bottom one) we know that the opposite of zero is negative zero.
Hope this helps!!!