127.

1. $(1,\infty )$

2. $(2,\infty )$

3. $(2,\infty )$

4. $(11,\infty )$

129. $y=\log x\to y=\log (x-2)\to y=\text{log }\left({\displaystyle \frac{1}{2}}x-2\right)\to y=3\log \left({\displaystyle \frac{1}{2}}x-2\right)\to y=-3\log \left({\displaystyle \frac{1}{2}}x-2\right)\to y=-3\log \left({\displaystyle \frac{1}{2}}x-2\right)+4$

131.

1. $24,659.70

2. 4.05%