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Carla has $300 in her bank account. Each time she goes to the ATM, she withdraws $20. Write a function for the amount of money left in her bank account. m = the bank account and x = a number of times she withdraws money.

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Okay. A function for this situation would be m = 300 - 20x. This is because Carla has $300 left in the bank account and she take out $20 per withdrawal.  As she withdraws more money from the bank, the total amount of money in there gets less and less.