Final answer:
To find the measure of angle T, subtract the known angle measures from 180°. The measure of angle T in triangle RST is 115°.
Step-by-step explanation:
In a triangle, the sum of the angles always equals 180°. The student has a triangle RST with m°R = 15° and m°S = 50°. To find m°T, we simply subtract the sum of angle R and angle S from 180°:
m°T = 180° - (m°R + m°S)
m°T = 180° - (15° + 50°)
m°T = 180° - 65°
m°T = 115°
Therefore, the measure of angle T in degrees is 115°.