15-05-2017
Mathematics

contestada

You can buy 3 post cards for $5.40 , 6 post cards for $10.80 or 9 postcards for $16.20.What is the constant of proportionality for buying post cards?

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yguo0818 yguo0818

15-05-2017

the answer should be buy 1 postcard is $1.80

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AnnabethChase139 AnnabethChase139

15-05-2017

1 post card is $1.80.

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