Perform the indicated operation.

ADD:

1. (5x⁴ – 3x² + 4) + (6x³ – 4x² – 7)
2. –7x³y + 4x²y² – 2 and 4x³y + 1 – 8x²y2
3. (5 + 24y³ - 7 y² + 5)
4. (2x⁵ - 6x³ - 12x² - 4) + ( -11x⁵ + 8x + 2x² + 6)
5. (3y⁵ – 2y + y⁴ + 2y³ + 5) and (2y⁵ + 3y³ + 2+ 7)

SUBTRACT:

6. (5x⁴ – 7x² + 3x – 4) – (8x³ + 2x² + 3x – 7)
7. (2x²y – 5xy + 3y²) – (7xy – 6y² + 5x²y)
8. (9x⁵ – 6x³ + 7x³) – 7x³ – 6x⁵ + 2x²)
9. Subtract 4x³ – 5x – 8 from 6x² – 3x + 8
10. (1.5y³ + 4.8y² + 12) - (y³ - 1.7y² + 2y)

with solutions pls. ​