How do I change 14.99398 mi into three significant figures

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

This statement about matter and its behavior is best classified as a