What percentage of U.S. States currently has an English-only policy?

Who proposed the concept that when there is more emphasis on one, it means less emphasis on others?

a) Rensis Liker b) Robert Blake c) Jane Mouton d) Victor Vroom

Based upon the criteria for determining the "richness" of communication channels, which of

the following would be the richest channel of communication? A) a live video conference B) an exchange of e-mail C) a personal letter D) a memo sent by your boss