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I need help on 7 and 8.

 

 Aug 18, 2020
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7      three angles of a triangle sum to 180    soa angle A = 60o

              the second triangle    60 = 3x+15     solve for x

 

8     180   -   42  - 108  = 4x-4       solve for x   then compute 2x

 Aug 18, 2020

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