Answer:

1. 53 - 18 = 53 + (-18) = 71

2. 50 - 72 = 50 + (-72) = -122

3. 215 - (-65) = 215 + 65 = 280

4. (-49) - 36 = (-49) + (-36) = -85

5. (-21) - (-49) = (-21) + 49 = 70

Step-by-step explanation:

I hope it helps. btw if you think my answers are incorrect, feel free to change it.