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11 February, 22:20

Sibal started with $500 in a bank account that does not earn interest. In the middle of every month, she withdraws 1/5 of the account balance.

Which recursive function rule models Sibal's balance at the end of each month?

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  1. 11 February, 22:31
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    4/5 of the original amount at the start of the month will remain. The amount at the start of every month will change. Thus:

    an = 4/5 (an-1); where a1 = 500.
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