Reed, Riley, Ean, and Michael want to run a race against each other. They start on the 20 yard line of the football field and finish at the 50 yard line. The times for them to complete the race are listed in the table.
Reed
4 seconds
Riley
5 seconds
Ean
6 seconds
Michael
10 seconds
Which of the boys ran the race at an average speed of 5 yards per second?

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.