\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
A gym membership costs a joining fee of \(\dollar\)50 and a monthly subscription of \(\dollar\)30.
  1. Write a linear model \(C(m)\) for the total cost after \(m\) months.
  2. Calculate the total cost after 2 years.
  3. If a member has paid a total of \(\dollar\)590, how many months have they been a member?

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