Table 2.3 gives the amount of federal spending in billions of dollars for agriculture for several years.

(a) Let x = 0 represent 1990, x = 1 represent 1991, and so forth. Make a scatter plot of the data.
(b) Let P represent the point corresponding to 2003, Q₁ the point corresponding to 2000, Q₂ the point corresponding to 2001, and Q₃ the point corresponding to 2002. Find the slope of the secant line PQ, for i = 1, 2, 3.

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Table 2.3 Agriculture Spending Year 1990 1995 1999 2000 2001 2002 2003 Agriculture Spending ($ billions) 12.0 9.8 23.0 36.6 26.4 22.0 22.6