Algebra 1: A Function Approach Part 2 There is a difference of 9 years between the oldest and youngest child in the Petronides family. If the sum of their ages is 17 years, which equation describes y, the age of the youngest child?

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?