Contagious diseases can spread very quickly. suppose five people are ill during the first week of an epidemic and that each person who is ill spreads the disease to four people by the end of the next week. by the end of the tenth week of the epidemic, how many people have been affected by the illness?

Leading guitar string producer wound up inc. has enjoyed a competitive advantage based on its proprietary coating that gives its strings a clearer sound and longer lifespan than uncoated strings. one of wound up's competitors, however, has recently developed a similar coating using less expensive ingredients, which allows it to charge a lower price than wound up for similar-quality strings. wound up's competitive advantage is in danger due to a. a lack of perceived value b. a lack of organization c. direct imitation and substitution d. resource immobility