In a group of 25 girls, 8 are on the cross country running team, 13 are on the math league team, and 6 are on both teams. How many of the girls are not on a team?

Which explains whether or not the values in the table represent a direct variation? x 4 6 10 20 y 1 1.5 2.5 5 the table represents a direct variation because the values are proportional. the table represents a direct variation because the values are nonproportional. the table does not represent a direct variation because the values are proportional. the table does not represent a direct variation because the values are nonproportional.