Mathematics, 03.12.2020 21:20 cjsboardinghouse

Help me plz Ik it is so easy but I just forgot how to do it ... my sister she forgot how to do it to and she sis in 12 grade soo like help plz

Help me plz Ik it is sooooo easy but I just forgot how to do it ... my sister she forgot how to do

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Help me plz Ik it is so easy but I just forgot how to do it ... my sister she forgot how to do it to...