Answer:
3x⁹, 2x - 5(3x²), 8x + 2x/3 + 6, x + 3 - y - 6
Explanation:
3x⁹ has one term, so it comes first. 2x - 5(3x²) has two terms, so it comes next. 8x + 2x/3 + 6 has three terms and comes next. The last one is x + 3 - y - 6 because it has four terms.