In some cases the answers you will get won’t make physical sense or will need a bit of interpreting. Look at the next example and be careful when you interpret your final solution. 4. Tanisha and Rebecca are signing up for new cellphone plans that only charge for their number of minutes and everything else is included in a monthly fee. Their plans are as follows:

Tanisha’s plan: $0.15 per minute used talking and a $25 monthly fee.

Rebecca’s Plan: $0.10 per minute used talking and a $18.50 monthly fee.

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Part A: Figure out after how many minutes the two plans will charge the same amount?

Part B: Interpret your answer. It may help to read their two plans again and think about which one you would rather pay.