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I dont understand how to do these three questions

I dont understand how to do these three questions
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2 votes
I dont understand how to do these three questions

I dont understand how to do these three questions-example-1
User Alexander Smirnov
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1 Answer

1 vote
9.
Well the first has the angles being 3x+12,x,and 90 so they have to add up to 180 degrees because it is a triangle.
3x+12+x+90 = 4x+102 = 180 solve
4x+102=180
4x=78
x=19.5
User Chocolata
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8.7k points
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