Making a community program sustainable and viable over a long period, or part of everyday life in the community, is sometimes termed:

You are watching a video of a man in a developing country performing a task intended to determine if he is in the formal operations state of development. The person performing the task is 28 and he is performing quite poorly. What explanation would late 20th-century researchers have given to account for his poor performance?

a. He was cognitively incapable of formal operations. b. He did not have formal education that included the scientific method. c. He had previously experienced brain damage. d. He was not interested in "proving" his abilities.

For the numbers 17, 2, 9, 12, 15, the range is ________

a. 15 b. 9 c. 12 d. 2