In triangle RST, m<R = 5x -3, m<S = 3x + 2 and m<T = x+10. Find m<R

Answer 1

since R+S+T=180°

5x-3 + 3x+2 + x+10 = 180
9x +9 = 180
9x = 171
x = 19

m<R = 5x-3 = 92°