Mathematics, 27.08.2021 04:20 monica1670

Allen is reviewing his receipts from three different visits to a spa, trying to determine the individual costs of his
favorite spa treatments. From his receipts he knows:
A manicure and a back rub together
cost $18.
A back rub and a facial together
cost $19.
A manicure and a facial together
cost $21

Answers: 1

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Allen is reviewing his receipts from three different visits to a spa, trying to determine the indi...