Answer:
x=65
Step-by-step explanation:
The angle with the measurement of 125 degrees is supplementary to the one adjacent to it (sharing the same vertex and on same line).
What that means is that the measurement of the angle adjacent to that angle of 125 degrees is 180-125=55.
So now we know the sum of the interior angles of a triangle add up to be 180 degrees.
That is we have to solve the following equation for x:
x+55+60=180
Add 55 and 60:
x+115=180
Subtract 115 on both side:
x=180-115
Simplify:
x= 65
