Which distance measures 7 units? a number line going from negative 8 to positive 8. a closed circle appears at negative 7 and is labeled l. a closed circle appears at negative 1 and is labeled m. a closed circle appears at positive 2 and is labeled n. a closed circle appears at positive 6 and is labeled p. an orange arrow line is above the number line with an arrow pointing left passed negative 7 and right passed positive 6. it contains all points. the distance between points l and m the distance between points l and n the distance between points m and n the distance between points m and p