The number of pieces of first-class mail delivered in the United States is shown in the graph.

(a) If a straight line were drawn through the tops of the bars for 2011 and 2016, would this line have positive or negative slope? Explain.(b) Use the information given for the years 2011 and 2016, letting x = 11 represent 2011 and x = 16 represent 2016, and letting y represent the number of pieces of mail (in billions), to write an equation that models the data.(c) Use the equation from part (b) to approximate the number of pieces of first-class mail delivered in 2015 to the nearest tenth. How does this result compare to the actual value, 62.6 billion?

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First-Class Mail 75 72.5 70 65 60 55 50 0 Pieces of Mail (in billions) www. 61.2 …... .... .... 2011 2012 2013 2014 2015 2016 Year