Answer:
101
Step-by-step explanation:
(There is a shorter way to solve this, is in the other answer omg sorry)
First we have to find the last angle of the smallest triangle.
The addition of all angles in a triangle is always 180º so that means:
39 + 25 + y = 180
y = 180 - 64
y = 116
Now that we know the value of that angle we can find the other angle (not x) and with it we can get the answer.
Because flat angles are 180º too
Then:
116 + z = 180
z = 180 - 116 = 64
Finally now we calculate the addition of all angles again to find x:
x + 15 + 64 = 180
x = 180 - 79
x = 101
Hope it was helpful ;)
