2.66 Fuel consumption. In Exercise 2.21 (page 97), you examined the relationship between CO₂ emissions and highway fuel consumption for 527 vehicles that use regular fuel. In Exercise 2.44 (page 105), you found the correlation between these two variables.

1. (a) Find the equation of the least-squares regression line for predicting CO₂ emissions from highway fuel consumption.

2. (b) Make a scatterplot of the data with the fitted line.

3. (c) How well does the line fit the data? Explain your answer.

4. (d) Use the line to predict the value of CO₂ for vehicles that consume 8.0 liters per kilometer (L/km).