When a person buys something from an app store, the cost of the item is charged to a credit card whose number often is known by the app store. on what type of device is the credit card number kept by the app store?

Three out of five seniors remain undecided about a college major at the end of their senior year.

Helen's credit card has an apr of 15.32% and a grace period of 17 days and helen pays her balance in the full every month. if her last billing cycle ended on september 26, 2009, and she made her payment on october 11, 2009, did she owe any interest on her last statement's balance?

Write a program that asks the user to enter the name of an input file. if the file does not exist, the program should prompt the user to enter the file name again. if the user types quit in any uppercase/lowercase combinations, then the program should exit without any further output.