The following graph, which tracks the rate of traumatic brain injury−related deaths per 10...

The following graph, which tracks the rate of traumatic brain injury−related deaths per 100,000 people, appeared on a website for the Centers for Disease Control and Prevention.

(a) What is the general trend for youth age 15–19 years?

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(b) Let x = 9 correspond to the year 1999. Approximate a linear function to fit the data using 22 as the number of deaths in 2000 and 11 for 2010.

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(c) If the trend continues, estimate the deaths per 100,000 people in the year 2012.