Answer:
8x=32
Step-by-step explanation:
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18
21 - 4x = 108
<em><u>Subtract 21 from both sides</u></em>
-4x = 87
<em><u>Divide both sides by -4</u></em>
x = -21.75
<em>C = 13π ≈ 40.82 units </em>
C = 2 r π = d π
AB = = 13 units
<em>C = 13π ≈ 40.82 units</em> ( π ≈ 3.14 )