Row Echelon Form. \[ \text { c. }\left(\begin{array}{llll}1 & 2 & 1 & 2 \\ 1 & 3 & 1 & 3 \\ 1 & 4 & 1 & 4\end{array}\right) \]

Solve \( \sqrt{2 x}=x-4 \)

Charlotte rides the bus 8 minutes every day. Let \( d \) represent the number of days and \( m \) represent the total number of minutes Charlotte spends on the bus. Use the function \( m=8 d \) to find the value of \( m \) when \( d=4 \). \( m=\square \)

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 \( a=7 \).

A furniture company plans to have 19 employees at its corporate headquarters and 8 employees at each store it opens. Let \( s \) represent the number of stores and \( m \) represent the total number of employees. \( m= \) the function \( m=8 s+19 \) to find the value of \( m \) when \( s=2 \).

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 \( s=7 \).