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gayaneshka [121]
3 years ago
11

Please help me with this and explain it to me, thank you!

Mathematics
1 answer:
MArishka [77]3 years ago
7 0
9+2=X
F(x)=f(9) + 2(9 - 1) if i remember correctly.
there would be 31 seat in the 12th row
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