Mathematics, 25.10.2020 19:10 TheCampingStone

A basic cellular package costs $30 per month for 60 minutes of calling, with an additional charge of $0.50/min beyond that time. The cost formula would be C = 30 + 0.50(x − 60),
where C is the cost measured in dollars and x is the number of calling minutes used. If you cannot have a bill greater than $90, what is the maximum number of calling minutes you can use?

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A basic cellular package costs $30 per month for 60 minutes of calling, with an additional charge of...