Respuesta :

soooobored
the interior angles of a triangle add up to be 180 degrees

which means
10x-4+8x+3+91=180

can you solve for x?
91+18x−4+3=180
18x+90=180
18x=180−90
18x=90
x= [tex] \frac{90}{8} [/tex]

x=5
Hope this helped!

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good job