Answer tell me the answer and how to do it

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

The pair of coordinates that do not represent the point( 5,150’) is a. (5,-210) b. (5,210) c. (-5,330) d. (-5,-30)