Suppose the weights of 1 year-old boys are approximately normally distributed, with a mean of 22.8 Ibs and a standard deviation of about 2.15. if we randomly select a 1-year-old boy, what is the probability that he'll weigh more than 20 pounds?

An incoming airplane is x miles due north from the control tower at an airport. a second incoming airplane is y miles due east of the same control tower. the shortest distance between the two airplanes is z miles. which of the following functions would best model the situation above?