3. The following table shows Amazon's approximate net sales (Revenue) and operating expenses in 2011 - 2014. Net Sales ($ billion) Operating Expenses ($ billion) 50 11 60 16 70 23 80 25 a. Use this information to find a linear regression model for Amazon's operating expenses E (in billions of dollars) as a function of net sales S (in billions of dollars). Sketch the data and the regression line below. You may use Excel or your TI-84. b. What, according to the model, would Amazon's operating expenses be if net sales were 90 billion? Round to nearest billion.

3. The following table shows Amazon's approximate net sales (Revenue) and operating expenses in 2011 - 2014. a. Use this information to find a linear regression model for Amazon's operating expenses E (in billions of dollars) as a function of net sales S (in billions of dollars). Sketch the data and the regression line below. You may use Excel or your TI-84. b. What, according to the model, would Amazon's operating expenses be if net sales were 90 billion? Round to nearest billion