In triangle NLM, point S is the centroid, QS = (3x – 5) cm, and NS = (4x) cm. Triangle N L M has centroid S. Lines are drawn from each point to the midpoint of the opposite side to form line segments N Q, L R, and M P. The length of line segment N S is 4 x and the length of line segment S Q is 3 x minus 5. What is NS? 5 cm 10 cm 20 cm 30 cm