American child death rates (per 100,000 children ages 5€“14 years) are shown in Table 11 for various years.

Let C = f (t) be the U.S. child death rate (per100,000 children) at t years since 1980.
a. Graph the model f (t) = -0.55t + 30.09 on a scatterplot. Does it come close to the data points?
b. What is the C-intercept? What does it mean in this situation?
c. Use f to estimate the U.S. child death rate in 2012.
d. Use f to estimate when the child death rate was 15 deaths per 100,000 children.
e. Approximately one-third of all child deaths are due to unintentional injuries. Estimate the child death rate due to unintentional injuries in 2011.

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Table 11 U.S. Child Death Rates Child Death Rate (number of deaths per 100,000 children) Year 1980 1990 1995 2000 2005 2010 2013 30.6 24.0 22.5 18.0 16.3 12.9 13.0