Could a zombie apocalypse happen? just need to confirm.

Firms use marginal analysis to determine prices by a) changing prices in accordance with information from retailers. b) using comparisons with strong competitors to position prices accordingly. c) examining the effect on revenue of small changes to the price of one item. d) trying to minimize production costs by using better and more efficient methods.

Assume that the banner needs to be 18 feet long instead of 15 feet

Doing a science fair project should i do cafeteria waste or solar power