Plz, help i dont understand dis. Analysis Changes over time are called trends. You can see on the graph a downward trend in the Appalachian and Interior regions and an upward trend in the Western region. Try predicting future coal production. Using a ruler, draw the lines for each region. Go beyond 2011. Draw the line with the same pattern it follows on the graph. The extension of the lines is based on what you predict will happen with coal production.

Questions 1. How much coal will be produced in the year 2020 for each region?

2. What trend would you predict for the next ten years for each region?

3. If people keep using coal in the same way, scientists say there may be enough coal reserves to last 200 to 300 years. Does your graph show trends that match what scientists say? What kinds of factors might cause them not to match?

4. Can you think of any problems that could come from using only 15 years of data to predict trends for the next 100 years? Explain your answer. How could you prevent some of these problems?