12-09-2018
Mathematics

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Solve for angle 9x+20

Solve for angle 9x20 class=

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12-09-2018

Look at the picture.

[tex](9x+21)+(6x-6)=180^o\\\\(9x+6x)+(21-6)=180\\\\15x+15=180\ \ \ \ |-15\\\\15x=165\ \ \ \ |:15\\\\x=11\\\\9x+21=9(11)+21=99+21=120^o[/tex]

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