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Write the function rule that gives the value of a dollar x years from today

Inflation runs at a steady 3% per year, then the amount that a dollar is worth today decreases by 3% each year.
Write the function rule that give the value of a dollar x years from today.
 

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Robert J. | Certified High School AP Calculus and Physics TeacherCertified High School AP Calculus and Ph...
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Focus on the remaining part. After x years, 1 dollar becomes
f(x) = (1-3%)^x dollars