What are the square qr code looking thing in the corner of documents?

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?

Consider jasper’s balance sheet. which shows how to calculate jasper’s net worth?

When can you access the bios setup utility?