It could include all real numbers, really. If you have +$130 you could use them to pay for something. If you have -$27.5 you need to pay this sum to the bank, since you overused your credit.
D)The range would include all real numbers. ;
The range of the function representing the balance on a credit card each month would mainly include positive integers. However, since balances can also be negative due to debt, it can range through both positive and negative integers. Thus, the most accurate option reflecting typical credit card activity would be option B, focusing on usable (positive) balances.
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