Which of the contexts below could not be modeled by a linear function?
Hudson puts $15 a month into a savings account.
Money invested in a savings account grows at an annual rate of 3.5%.
A taxi charges a flat fee of $4.00 for pick-up, then an additional fee of $3.25 per
mile.
An amusement park charges $2.50 to go on each of the rides.
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