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posted by tina on Friday, August 2, 2013 at 4:05pm.

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

since R+S+T=180° 5x-3 + 3x+2 + x+10 = 180 9x +9 = 180 9x = 171 x = 19 m<R = 5x-3 = 92°

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