Let $s$ be the set of complex numbers of the form $a + bi,$ where $a$ and $b$ are integers. we say that $z \in s$ is a unit if there exists a $w \in s$ such that $zw = 1.$ find the number of units in $s.$

Chipotle mexican grill, the american mexican food chain restaurant, opened its first restaurant in the united states in 1993. in 2010, chipotle opened its first restaurant in the united kingdom in london on charing cross. by late may 2013, the company had 6 restaurants in london, but they have not been doing well even though the british have taken a liking to mexican food (boyle, 2013). why has this successful u.s. chain not seen the same success overseas? if you were chipotle's ceo, how would you fix this situation? what is an alternative means of venturing outside of its domestic markets that may allow for a competitive advantage? then, pick a company that has not yet expanded overseas, or if it has expanded, suggest a different strategy for entrance into an overseas market that you feel would be more strategic for the company. research its rivals in the global marketplace and market conditions in the overseas market you are targeting. justify your recommended entry strategy based on these industry and market conditions.

James is an employee in the widget inspection department of xyz systems, a government contractor. james was part of a 3-person inspection team that found a particular batch of widgets did not meet the exacting requirements of the u.s. government. in order to meet the tight deadline and avoid penalties under the contract, james' boss demanded that the batch of widgets be sent in fulfillment of the government contract. when james found out, he went to the vice president of the company and reported the situation. james was demoted by his boss, and no longer works on government projects. james has a:

Which of the following statements is true of the balanced-scorecard? a. it is a more or less a one-dimensional metric of measuring competitive advantages of a firm. b. it is one of the traditional approaches of measuring firm performance. c. its primary focus is to base a firm's strategic goals entirely on external performance dimensions. d. it attempts to provide a holistic perspective on firm performance.