Answer:
<R = 23
Step-by-step explanation:
The three angles of a triangle add to 180 degrees
<S + <T + < R = 180
We know < S = 90 and < T = 67
90 + 67 + R = 180
Combine like terms
157 + <R = 180
Subtract 157 from each side
157-157+ < R = 180-157
<R = 23
