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Need help on question 12&13
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Need help on question 12&13

Need help on question 12&13-example-1
User Terry Spotts
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1 Answer

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12.

\alpha=(360)/(n)\\ 18=(360)/(n)\\ n=20

13.

(4)/(10)=0.4\\\\ 1-0.1-0.4=\boxed{0.5}
User John Small
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