Christine's family went to the beach. They got to the beach at 11:20 A. M. and swam in the ocean for 1 hour and 10 minutes. Then they built sand castles for 45 minutes and played volleyball for 50 minutes before heading home. What time was it when Christine's family left the beach?

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?