Answer :

Answer:

11.75

Step-by-step explanation:

5x+3x-4+90 = 180

(the sum of interior angles of a triangle is always 180

8x-4+90 = 180

+4              +4

8x+90=184

-90       -90

8x=90

/8    /8

x = 11.75

Answer:

11.75

Step-by-step explanation:

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