a) To make the table for the proportional relationship, given that he delivers 14 newspapers in 20 minutes, the first step is to determine the unit rate (or constant of proportionality), that is, the number of papers he delivers in one minute.
Let x be the time in minutes and y be the number of newspapers delivered, their relationship can be expressed as:
![y=kx](https://img.qammunity.org/2023/formulas/mathematics/college/zfnjlk9kn7jg7cyy0nlnepmsiaxj3b2oge.png)
Where k is the constant of proportionality, you can calculate it as:
![k=(y)/(x)](https://img.qammunity.org/2023/formulas/mathematics/college/wv14j43itnsadhncorbnwrfk6wu4fu47he.png)
For x=20 and y=14
![k=(14)/(20)=(7)/(10)=0.7](https://img.qammunity.org/2023/formulas/mathematics/high-school/1t41hz139ty7xaa2nl9hk7jb8wv53uqv2g.png)
The unit rate is 0.7 newspapers per minute.