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Mathematics, 06.12.2019 10:31 epicsushiman1

Kayla is sending invitations to 20 of her friends for a pizza party. if there are 12 invitations left to send out, how many invitations has she already mailed?
°a). x-8=20
°b). x+20=12
°c). x+8=12
°d). x+12=20

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