Why are the keys on the qwerty keyboard arranged the way they are?

Chiko bought 75 shares of stock at $19.58 per share. he received dividends of $73.42 during the year. at the end of the year, his stock was valued at $22.14. what was his purchase price?

Technician a says that a dry sump system uses no oil storage sump under the engine. technician b says that a wet sump system uses no oil storage sump under the engine. who is correct?

Why were most movies from the late 1890s until the early 1930s only filmed in black and white? there were only a few people who could afford the technology to produce color motion pictures back then. audiences did not want color motion pictures until later. the film used to make color motion pictures often overheated, which was a safety hazard, so it was generally not allowed. color films had to be hand-colored, frame by frame.