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Lostsunrise [7]
3 years ago
13

Cuanto es r2-2r-7=0​

Mathematics
1 answer:
vekshin13 years ago
6 0

Answer:

Step-by-step explanation:

The solution is attached

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The answer to your question is below

Step-by-step explanation:

9)

They are supplementary angle. The sum of supplementary angles is 180°.

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They are vertical angles. Vertical angles measure the same

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12)

They are supplementary angles. The sum of supplementary angles is 180°

                  b + 35 = 180

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                  b = 180 - 35

                  b = 145°

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