Respuesta :

Answer: x=10

Step-by-step explanation: All three corners added up equals 180 degrees. 180-57=123    123-(4+9)=110     110/ (4+7)  = 10

wildorodd

Answer:

x=10

Step-by-step explanation:

Interior Angle sum of a triangle is 180. So the angle measures are 57, 4x+4, and 7x+9. You can make an equation of 11x+70=180 by adding the angle measures together. Subtract 70 from both sides, so 11x= 110. x=10.