Mitchell records the amount of time a toy car takes to travel down a ramp one time for each of four slope angles. His lab partner, Sarah, suggests that he run the same set of trials two more times. What argument should Sarah use to support her suggestion?

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.