Mr. mckay teaches about 100 students in his senior english classes in a large high school. if his students match the national norms for twelfthâ graders, how many of his students probably usedâ marijuana, alcohol, or other illicit drugs in the past 30â days?a. 25b. 15c. 20d. 10

An externality can be created by a. people working at a production job and enjoying their work b. a production activity but not a consumption activity c. a consumption activity but not a production activity d. a production activity or a consumption activity externalities a. are always positive, and an example is flu vaccinations b. are always negative, and an example is the pollution created by trucks c. can be negative or positive. logging has a negative externality, and education has a positive externality d. can be negative or positive. a negative externality is having to go to school when you would rather go to the beach, and a positive externality is spending time with your friends