Add Subtract: 1. (5x4 – 3x2 + 4) + (6x3 – 4x2 – 7) 6. (5x3 – 7x2 + 3x – 4) –(8x3 + 2x2 +3x – 7) 2. –7x3y + 4x2y2 – 2 and 4x3y + 1 – 8x2y2 7. (2x2y – 5xy + 3y2) – (7xy – 6y2 + 5x2y) 3. (5 + 24y3 - 7y2) + (-6y3 + 7y2 + 5) 8. (9x5 – 6x3 + 7x2) – (7x3 – 6x5 + 2x2) 4. (2x5 - 6x3 - 12x2 - 4) + (-11x5 + 8x + 2x2 + 6) 9. Subtract 4x3 – 5x – 8 from 6x2 – 3x + 8 5. (3y5 − 2y + y4 + 2y3 + 5) and (2y5 + 3y3 + 2+ 7) 10. (1.5y3 + 4.8y2 + 12) - (y3 - 1.7y2 + 2y)​