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Evgen [1.6K]
3 years ago
9

Please help I don't get this

Mathematics
1 answer:
neonofarm [45]3 years ago
7 0

Answer:

18n+9

Step-by-step explanation:

9(2n+1)

  • multiply the 9 with the numbers in the parenthesis

18n+9

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Comments

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In any given triangle the sum of its interior angles must be equal to 180º.

This has to do with lines and parallelism, and if you trace a Triangle and to parallel lines one of them being the base of it, this can be proven too.

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