need help ASAP (what is the measure of angle x )

Well we know the sum of all the angles on a triangle is 180.
And we already know 2 of the sides: 102 and 31. So add them up and subtract it from 180.
102 + 31 = 133.
180 - 133 = 47.
So "x" is 47.
Answer:
x = 47
Step-by-step explanation:
The sum of the 3 angles of a triangle always add up to 180, therefore...
31 + 102 + x = 180
Add like terms.
133 + x = 180
Subtract 133 from both sides.
x = (180 - 133) = 47