Add. PLS HELP I WILL GIVE BRAINLIEST PLUS EXTRA POINTS

1. [4−11−75]+[1−163]

[5−12−18]
[5−10−138]
[5−13−108]
[5−1−128]
2.Subtract.

[50−2]−[−138]

Enter your answer in the boxes.
[
]

Multiply.

3. [4−10512]

[12−301536]
[1−4−32−2−1]
[723845]
[12−30512]
4. Multiply.

−12[6−7]

[−3−7]
[−3312]
[−1214]
[312−3]