1. **Stating the problem:** We are given data showing the amount of lemonade in a juice dispenser over time during a school dance. The goal is to graph this data on a 1-cm grid. 2. **Understanding the data:** The data points are: - At time $0$ minutes, amount is $4.0$ liters - At time $30$ minutes, amount is $3.5$ liters - At time $60$ minutes, amount is $2.5$ liters - At time $90$ minutes, amount is $1.8$ liters - At time $120$ minutes, amount is $1.0$ liters - At time $150$ minutes, amount is $0.5$ liters 3. **Plotting the points:** On the graph, the x-axis represents time in minutes from $0$ to $150$ in increments of $30$. The y-axis represents the amount of lemonade in liters from $0.5$ to $4.0$. 4. **Connecting the points:** Draw straight lines connecting each consecutive point to show the decreasing trend of lemonade amount over time. 5. **Interpreting the graph:** The graph shows a steady decrease in lemonade amount as time passes, indicating lemonade is being consumed or used during the dance. This completes the graphing of the data as requested.