What age should a child be left alone at home?

i have a daughter that is 9 she will be 10 in 3 months I trust her very much so. but she has been asking if she can stay home alone like when I go to the store because she doesn't want to go but I don't know if that is a safe age. what do you think?
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thank you every one!
What age should a child be left alone at home?
5
9
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