Question

What's the value of x?​

Answer 1

75

if your teacher says

that it is wrong then tell him/her to study once again

Answer 2

x = 75

Explanation:

The angle vertically opposite 50° is also 50° ( congruent )

The sum of the 3 angles in a triangle = 180°

Subtract the sum of the 2 angles from 180° for x

x = 180° - (50 + 55)° = 180° - 105° = 75°