if you can explain it best, and answer them you'll get a brainliest

Answer:
11. -3 - (-8) = 5
12. -10 + (-25) = -35
13. -11 - (-10) = -1
14. 12 + (-5) = 7
15. -9 (9 + (-9) = 0)
Step-by-step explanation:
I don't really know how to explain it. For 11 I just found found the difference kind of. It's easier if you draw out a number line. 12 is self - explanatory, you just add the two negative numbers and it will be a negative. I look at 14 as just another minus equation.
Answer:
11. 5
12. -35
13. -1
14. 7
15. -9
Step-by-step explanation:
11. -3-(-8)
= -3 + 8 (double negative is positive)
= 8-3
= 5
12. -10 + (-25)
= -10 -25 (positive negative is negative)
= -35
13. -11 - (-10)
= -11 + 10
= -1
14. 12 + (-5)
= 12 - 5
= 7
15. 9 + x = 0
x = 0 - 9
x = -9
PLS GIVE BRAINLIEST