17. At the museum, you can buy 3 postcards
for $5.40, 6 postcards for $10.80, or 9
postc...
Mathematics, 20.02.2020 06:10 gugu1004
17. At the museum, you can buy 3 postcards
for $5.40, 6 postcards for $10.80, or 9
postcards for $16.20. What is the
constant of proportionality for buying
postcards?
Answers: 2
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