Hi Landen, I'm not sure what you mean by "long time", nor "small mistake". Sometimes it's not just a matter of changing the answer in the answer cell of the database. If there is an exercise where the wrong answer is accepted, and it has already been reported but not fixed in a reasonable time, please send a Help request using the link/button in the upper right hand corner of this page: https://khanacademy.zendesk.com/hc/en-us

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