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Please Perform The Operation.
Add:
1.) A - 5
+ 2a - 3

2.) 5t² - 6st + 8t - 3
+ 7t² + 8st - 2t + 9
3t² + 2st + 5t + 5


Subtract:
1.) 10m - 2n - 1
- 5m - 2n + 2

2.) -5x³ + 3x² +6x
- 3x³ + 9x² + 4x

:)