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MathPhys

Answer:

283°

Step-by-step explanation:

The sum of the arc angles is 360°.

7y − 7 + 4y + 6 + 20y − 11 = 360

31y − 12 = 360

31y = 372

y = 12

The measure of arc ABC is the sum of arcs AB and BC.

4y + 6 + 20y − 11

= 24y − 5

= 24(12) − 5

= 283

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