What percentage of players are girls?

One way to solve this is to subtract the number of boys from the total plyers to find the number of girls, then divide the number of girls by the total amount of players to find the percentage:

180 players - 108 boys = 72 girls.

72 girls / 180 players = 0.4 = 40% are girls.

Another way to solve is to find the percent of boys and subtract that from 100%:

108 boys / 180 player = 0.6 = 60% are boys

100% - 60% = 40% are girls.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value