There are currently 3 students signed up for a trip. the van can transport only 7 students. which graph shows all the possible values for the extra number of students that need to sign up so that more than one van is needed to transport them? number line with closed circle on 4 and shading to the right. number line with closed circle on 4 and shading to the left. number line with open circle on 4 and shading to the right. number line with open circle on 4 and shading to the left.