Answer:
4
Explanation:
Here we know that T is the midpoint of SU.
Therefore, we know ST and TU are equal.
Setting their values equal, we get:
x+3 = 4x
Then we isolate x by subracting x from both sides:
3=3x
Finally we divide by 3:
1=x
Now we can solve for TU:
4x= 4(1) = 4