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