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Perform the indicated operation
1. (5x⁴ - 3x² + 4) + (6x³ - 4x² - 7)
2. (5 + 24y³ - 7y²) + (-6y³ + 7y² + 5)
3. (3y5 - 2y + y⁴ + 2y³ + 5) and (2y⁵ + 3y³ + 2 + 7)
4. (5x³ - 7x² + 3x - 4) - (8x³ + 2x² + 3x - 7
5. (9x - 6x³ + 7x²) - (7x³ - 6x⁵ + 2x²)
6. Subtract 4x³ - 5x - 8 from 6x² - 3x + 8​