Find the center of mass of a thin plate covering the region between the x-axis and the curve y = 20/x^2, 5\leq x\leq 8 , if the plate's desity at a point (x, y) is (x) = 2x^2

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad