I think you are trying to ask the value of x,
So, here it is,
By Angle Sum Property,
Sum of all angles of a triangle = 180°
So,
(3x + 13) + (x - 8) + x = 180°
3x + 13 + x - 8 + x = 180°
5x + 5 = 180°
5x = 175°
x = [tex] \frac{175}{5} = 35[/tex]
Value of x is 35.
Now,
m∠A ( Measure of ∠A ) =
3x + 13
3*35 + 13 = 105 + 13 = 118°
m∠A = 118°
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