Aplane flies round-trip to philadelphia. if flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour. if the total trip takes 6.5 hours, how many miles does the plane fly round-trip?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.