(Modeling) Solve the problem.
Bicycle Safety A survey found that 76% of bicycle riders do not wear helmets. (Source: Opinion Research Corporation for Glaxo Wellcome, Inc.)
(a) Write a linear function f that computes the number of people who do not wear helmets among x bicycle riders.
(b) There are approximately 38.7 million riders of all ages who do not wear helmets. Write a linear equation whose solution gives the total number of bicycle riders. Find this number of riders.
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