What is the reflection of the point (4,-3) across the line y=x (on a graph)

: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?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.