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I just downloaded a them and i dont know where it downloaded to how do i find it? is there a search tool that searches your whole phone for where it could have gone?

I'm in secondary 4 (grade 10 or 11) and this lady wants me to help her daughter in math who is in secondary 1. I was wondering how much i should charge and how much you usually should get paid and if it all worth it! Hope to get awesome answers! :)