Need help with linear functions and percentages (b) please, show your work!

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The percentage of high school students who drink and drive was 17.5% at the beginning of 2001 and declined linearly to 10.3% at the beginning of 2011.†(a) Find a linear function f(t) giving the percentage of high school students who drink and drive in year t, where t = 0 corresponds to the beginning of 2001 (t = 0). f(t) =  −0.72t+17.5  (b) If the trend continues, what will the percentage of high school students who drink and drive be at the beginning of 2019? 

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