Final answer:
To find all possible values of angle U, subtract the measures of angles S and T from 180°.
Step-by-step explanation:
To find all possible values of angle U in triangle STU, we can use the fact that the sum of the angles in a triangle is always equal to 180°.
Given that angle T is 110°, we can find angle U by subtracting the measures of angles S and T from 180°:
Angle S = 180° - 110° = 70°
Therefore, the possible values of angle U are 70°.