1. **State the problem:** Simplify the expression $$\frac{\log^3}{5b} \quad 21a \quad 10b^2$$ as given in the first problem set. 2. **Analyze the expression:** The problem appears to be a vertical stack of terms rather than a single fraction or equation. Since the user input is ambiguous, we interpret the first problem as simplifying or factoring the terms individually. 3. **Simplify each term:** - The first term is $$\frac{\log^3}{5b}$$ which is already simplified unless more context is given. - The second term is $$21a$$ which is a product of constants and variables. - The third term is $$10b^2$$ which is also a product of constants and variables. 4. **No further simplification possible:** Without additional operations or relations, these terms stand as they are. **Final answer:** The terms are $$\frac{\log^3}{5b}$$, $$21a$$, and $$10b^2$$ as given.