$72 is reduced to 60. what is the percent decrease in price

: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?

What is the distance between the points (2, 5) and (5,9)?

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?