2. (b) and reduce the result to a form having only positive exponents.

3. Find correct to three significant figures the negative root of the equation

4. Prove the rule for finding the sum of n terms of a geometrical progression of which the first term is a and the constant ratio is r.

4. Find the sum of 8 terms of the progression

5. A goldsmith has two alloys of gold, the first being

pure gold, the second