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nordsb [41]
3 years ago
8

This problem is substitution. X^-2-9X^-1+18=0

Mathematics
1 answer:
loris [4]3 years ago
6 0
Can explain it better?
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mash [69]
Total purchase she did : $20.90+$18.95=$39.85
7% tax means that we have to 7% or (7/100) extra
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total pay: 39.85+2.79=42.64
total cash: $50
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