What are the definition of these if your own words?

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

Find the slope of a line given the following two points

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol