How have computers changed since the 1930's

When copying and pasting text, the first step is move your cursor type the text select the copy command select the paste command

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?

What are the 12 colors of the spectrum called?