1. The scatter plot shows the annual profit for a certain airline (in millions of dollars) for years between 2000 and 2010. The equation of the trend line shown is y=0.4x+4.1, where x represents the year and y represents the profit. Use the equation to estimate the profit in 2002. Write an integer or a decimal.
2. The data table shows the price of a certain stock on the first day of several months in one year. The equation of the trend line shown is y=0.2x+13, where x represents the month and y represents the price of the stock. In which month was the price of the stock about $14.80?
3. Reasoning The data table shows the temperature inside an oven over the course of several minutes. The equation of the trend line shown is y=18.5x+92, where x represents the number of minutes and y represents the temperature in degrees Fahrenheit.
a. After about how many minutes was the temperature 203°F?
b. Could you use the data table to get a good estimate for the number of minutes? Explain.
4. Hiking The scatter plot shows a hiker's elevation above sea level during a hike from the base to the top of a mountain. The equation of a trend line for the hiker's elevation is y=8.77x+686, where x represents the number of minutes and y represents the hiker's elevation in feet. Use the equation of the trend line to estimate the hiker's elevation after 145 minutes. Round to the nearest whole number as needed.