Answer:
500-20w=220
Explanation:
w=14
it will take 14 weeks to have her balance at 220
-20w=220-500
-20w=-280
divide both sides by -20
500 - 20x = 220
$500 is the base cost, and she withdraws $20 per week. $220 would be the final cost, so x represents the amount of weeks.
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