Green Building Material The table lists U.S. demand for green building materials in billions of dollars for selected years. Year 2010 2011 70 2012 2013 Demand 65 75 80 Source: Freedonia Group. (a) Let x represent the number of years after 2010. Find a formula in slope-intercept form for a linear function f that models the data. (b) Interpret the slope of the graph of y = f(x). (c) Estimate the demand in 2020.

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