Math question: In triangle ABC, the angle bisector of angle A intersects side BC at point D. If the length of AD is 6 cm and BD is 8 cm, what is the length of DC?
+
What is the standard deviation of the following data set: 12, 17, 8, 10, 15?
+
What is the range of the cubic function f(x) = x^3 over the interval [-∞,∞]?