A membership to the local gym cost $40 and then $2 per visit. What is the maximum number of visits that can be made for $90 and is it modeled by a linear function or a exponential function?

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90-40=50: $90 dollars total. $40 dollars of that is the the cost so you have $50 dollars to find out.

$50÷$2=25: You have $50 dollars left and each visit is $2 so you went 25 times.