Cube Roots of Compound Expressions.

$295$, $25$.

[4]Exercise57.

1. $12$ yr.

2. A, $60$ yr.; B, $10$ yr.

3. A, $25$ yr.; B, $5$ yr.

4. $17\frac{1}{2}$ yr.

5. $35$ yr.

6. Son, $12$ yr.; father, $36$ yr.

7. $25$ yr.

8. A, $30$ yr.; B, $15$ yr.

9. Son, $12$ yr.; father, $68$ yr.

[6]Exercise58.

1. $1\frac{3}{7}$ dy.