For each set of data, use a cubic model to fit the data.
Use the model to estimate a value for the year of 2012 in billions of dollars.
U.S. Federal Spending
Year    Total (billions $)
1965         630
1980       1,300
1995       1,950
2005       2,650

Find a linear model for the data set below. (hint: you did this in the last lesson. Use that model to estimate the average sale price for a home in 2020.
U.S. Homes
Average Sale Price      Year (thousands $)
1990                                        149
1995                                        158
2000                                        207

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