Im having trouble solving triangle sum

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

What is the order of these fractions from least to greatest 2/3 7/10 5/8 65/100

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212