Respuesta :

4nxs
35 as angles in a straight line must add up to 180 and B is 90 as vertically opposite angles are equal

Answer:

x= 35

Step-by-step explanation:

Line EF is equal to 180 degree. We already have 55 degrees. Angle AB is clearly a 90 degree angle. Now we need to solve for x. 55+90=145.

now we will subtract 145 from 180. 180-145=35