Greg rolled a ball down the street. The ball went 10 meters south in 6 seconds. What was the velocity of the ball?
O A. 1 m/s south
O B. 1.67 m/s south
O C. 0.6 m/s south
OD. 0.2 m/s south

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a study of twenty 4th grade classrooms in which researchers ask the schools to systematically vary the time of day reading is taught, and collect weekly assessments of reading comprehension for each child over a three-month period.the collection of data, by a playground designer hired by the superintendent of schools, about the physical dimensions of school playgrounds, presence of fencing, and the kinds of equipment currently provided.a feasibility study for implementing a year-round school program, focusing on economic issues such a facilities utilization and transportation costs.an analysis of aggregate data comparing statewide high school graduation rates provided by the state department of public instruction, using county tax information.

What is the rule relating the ratio of marginal utility to prices of two goods at the optimal choice? explain why, if this rule does not hold, the choice cannot be utility-maximizing.

How much rainfall does the choco region of colombia receive each year a. less the 40 inches b. between 100 and 500 inches c. between 200 and 250 inches d. more then 400 inches