Sofia0307 Sofia0307 03-12-2020 Mathematics contestada Evaluate 1. 3a - 4c + b - 2d 2. -a +2b - 3c - 3d 3. 3a - 6b + 2c -2d 4. -4a + 2b + c -2d Pls help 40 points if you answer correctly and show me how you did it!