X+5y=20 select the ordered pair that is a solution to the equation

On a piece of paper graph f(x)=5•(0.4)^x

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

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?