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o-na [289]
2 years ago
10

Mark and eight of his friends went out to

Mathematics
2 answers:
Cerrena [4.2K]2 years ago
6 0
If mark and 8 of his friends went out the total of people is 9, so if you think about it 9x9=81 so the total cost of the bill was $81
melamori03 [73]2 years ago
3 0
72 EXPLANTION 9+9+9+9+9+9+9+9+9=72
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3x - 5y = 18 over

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Add them because the 5y's have the right symbols for us to add

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