I don't understand can you please help bedtime

1. (-5)-(-6)+(-1)
2. (-3.1)-(-7.5)+(+1.8)
3. (-9)+(-2)-(-6)+(-5)
4. (+5.2)+(-2.6)-(-3.7)
5. (-8)-(+7)-(+10)
6. (+4.5)-(-3.25)-(+1.5)
Please answer all 6 if possible thanks!

(-5)-(-6)+(-1) = 1 - 1 = 0

When you subtract a negative, the answer is positive.