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

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Mathematics
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Question description

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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(Top Tutor) Daniel C.
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School: Boston College
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