plz help me I will mark brainlest whoever answers with explanation​

Answer:
1. 3
2. -2.5+3= .5
3. <__________________>
-5 -4 -3 -2 -1 0 1 2 3 4 5
^ ^ ^
Step-by-step explanation:
When you add 3 to -2.5, the result is a positive .5. I wasn't sure what the number line meant, so I did my best