Cube Roots of Compound Expressions.

2. $72$.

3. $75$ and $57$.

4. $54$.

Exercise69.

1. $$2500$ at $4$%.

2. $$1600$ at $6$%.

3. $$6000$ at $4$%; $$4000$ at $5$%.

[4]Exercise70.

1. $22$ and $18$.

2. $60$ and $8$.

3. $\frac{14}{17}$.

4. Wheat, $$1$; barley, $$\frac{4}{5}$.

5. A, $$235$; B, $$65$.