Math Question: How many ways can a committee of 4 people be formed from a group of 8 individuals, considering both the order and members' identities?
+
Find the length of the major axis of an ellipse with a vertical major axis, when the coordinates of the foci are (0, ±9) and the distance between a focus and a vertex is 15.
+
Math Question: What is the factored form of the quadratic expression x^2 + 5x - 6?