Read the excerpt about the effects of poison gas. like some liquid the heavy-coloured vapour poured relentlessly into the trenches, filled them, and passed on. for a few seconds nothing happened; the sweet-smelling stuff merely tickled their nostrils; they failed to realize the danger. then, with inconceivable rapidity, the gas worked, and blind panic spread. —british eyewitness on the western front, 1915 according to the excerpt, how did the poison gas work to kill the soldiers?

Asupermarket has been experiencing long lines during peak periods of the day. the problem is noticeably worse on certain days of the week, and the peak periods are sometimes different according to the day of the week. there are usually enough workers on the job to open all cash registers. the problem is knowing when to call some of the workers stocking shelves up to the front to work the checkout counters. how might decision models the supermarket? what data would be needed to develop these models?