Answer:
19° = m∠B
73° = m∠T
88° = m∠R
Explanation:
Let x = measure of angle B
then 4x - 3 = measure of angle T
and 31 + 3x = measure of angle R
x + 4x - 3 + 31 + 3x = 180
8x + 28 = 180
8x = 152
x = 19° = m∠B
4(19) - 3 = 73° = m∠T
31 + 3(19) = 88° = m∠R