9. An ice manufacturing machine requires 10 minutes to warm up before the production of ice begins. The weight, in tonnes, of ice produced varies directly as the number of hours of production. Given that 20 tonnes of ice are produced when the machine is run for half an hour, find the weight of ice manufactured when the machine is run for \( 1 \frac{3}{4} \) hours.

Read the following description of a relationship: Tori uses 12 tomatoes to make each bowl of salad. Let \( s \) represent the number of bowls of salad and \( t \) represent the total number of tomatoes she uses. Use the function \( t=12 s \) to find the value of \( t \) when \( s=7 \).

Read the following description of a relationship: \[ \begin{array}{l}\text { Whitney has a superhero lunch box collection with } 20 \text { lunch boxes in it. From } \\ \text { now on, she decides to buy one new lunch box every year for her birthday. } \\ \text { Let } y \text { represent the number of years from now and } b \text { represent the total number } \\ \text { of lunch boxes in her collection. }\end{array} \] Use the function \( b=y+20 \) to find the value of \( b \) when \( y=1 \). \( b=\square \)

Read the following description of a relationship: \[ \begin{array}{l}\text { A furniture company plans to have } 19 \text { employees at its corporate headquarters } \\ \text { and } 8 \text { employees at each store it opens. } \\ \text { Let } s \text { represent the number of stores and } m \text { represent the total number of } \\ \text { employees. }\end{array} \] Use the function \( m=8 s+19 \) to find the value of \( m \) when \( s=2 \). \( m=\square \)

Read the following description of a relationship: \[ \begin{array}{l}\text { An electronics store has } 18 \text { permanent employees who work all year, The store } \\ \text { also hires some temporary employees to work during the busy holiday shopping } \\ \text { season. } \\ \text { Let a represent the number of temporary employees and } b \text { represent the total } \\ \text { number of employees during the holiday shopping season. }\end{array} \] Use the function \( b=a+18 \) to find the value of \( b \) when \( a=7 \).

Read the following description of a relationship: An electronics store has 18 permanent employees who work all year. The store also hires some temporary employees to work during the busy holiday shopping season. Let a represent the number of temporary employees and \( b \) represent the total number of employees during the holiday shopping season.