The percentages of tax returns in which individuals donated money to presidential elections by checking off boxes (for $1, $2, $3, or $6) on tax returns are shown in Table 66 for various years.

Let p be the percentage of tax returns in which presidential-election donation boxes were checked off at t years since 1970.
a. Use technology to construct a scatterplot.
b. Use technology to graph the model p = - 0.57t + 30.31 on the scatterplot. Does the line come close to the data points?
c. Rewrite the equation p = -0.57t + 30.31 using the function name f.
d. Find f (40). What does it mean in this situation?
e. Make an educated guess whether it has become more or less important for candidates to seek huge donations from wealthy Americans. Explain.

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Table 66 Percentages of Tax Returns in which Presidential-Election Donation Boxes Were Checked Off Years 1976 1986 1996 2006 2013 Percent 27.5 21.7 12.6 10.9 6.0