Expenditures for home health care in the United States are shown in the graph.

(a) If a straight line were drawn through the tops of the bars for 2012 and 2016, would this line have positive or negative slope? Explain.(b) Use the information given for the years 2012 and 2016, letting x = 12 represent 2012 and x = 16 represent 2016, and letting y represent spending (in billions of dollars), to write an equation that models the data.(c) Use the equation from part (b) to approximate the amount spent on home health care in 2015. How does the result compare with the actual value, $89 billion?

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Spending on Home Health Care 100 95 90 85 80 78. 75 Billions of Dollars OT 0 SESSUA 92 2012 2013 2014 2015 2016 Year