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Need help on question 12&13

Need Help On Question 12amp13 class=

Sagot :

12.
[tex]\alpha=\dfrac{360}{n}\\ 18=\dfrac{360}{n}\\ n=20[/tex]

13.
[tex]\dfrac{4}{10}=0.4\\\\ 1-0.1-0.4=\boxed{0.5}[/tex]