Based on the information given, the balance after w weeks will be 217 + 25.5w.
From the information given, Misumi started with $217 in her bank account and she deposits $25.50 each week and never withdraws any money.
Therefore, the expression that Misumi can use to determine her account balance after w weeks will be:
= 217 + (25.50 × w)
= 217 + 25.50w
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