3a) Each variable represents:
[tex]\begin{gathered} 0.25\le y\le1 \\ \text{represents the the number of time spend at the different fdays of the w}eek \\ \frac{15}{60\text{ }}\text{ = 0.25 hr (lowest )} \\ 1\text{ hour is the highest} \end{gathered}[/tex][tex]\begin{gathered} 7\le\text{ x }\le\text{ 12} \\ \text{Number of patient s attended to per day} \\ \text{The lowest is 7 and highest is 12} \end{gathered}[/tex][tex]\begin{gathered} 3b)\text{ }xy\text{ }\le\text{ 8} \\ \text{the product of the time spent during the day and the number of patients attended} \\ \text{to on that day will not exc}eed\text{ 8 hours} \\ \text{The product gives the time spent per day depending on the number of patient} \\ \end{gathered}[/tex]