Which number line shows the solution to 3 + (−3)? A number line is shown from negative 6 to 0 to positive 6. There are increments of 1 on either side of the number line. All the points are labeled on the number line. An arrow pointing from 0 to 3 is shown. Above this, another arrow pointing from 3 to 0 is shown. A vertical bar is shown at the tip of the arrowhead of the top arrow. A number line is shown from negative 6 to 0 to positive 6. There are increments of 1 on either side of the number line. All the points are labeled on the number line. An arrow pointing from 0 to negative 3 is shown. Above this, another arrow pointing from negative 3 to 3 is shown. A vertical bar is shown at the tip of the arrowhead of the top arrow. A number line is shown from negative 6 to 0 to positive 6. There are increments of 1 on either side of the number line. All the points are labeled on the number line. An arrow pointing from 0 to 3 is shown. Above this, another arrow pointing from 3 to 6 is shown. A vertical bar is shown at the tip of the arrowhead of the top arrow. A number line is shown from negative 6 to 0 to positive 6. There are increments of 1 on either side of the number line. All the points are labeled on the number line. An arrow pointing from 0 to negative 3 is shown. Above this, another arrow pointing from negative 3 to negative 6 is shown. A vertical bar is shown at the tip of the arrowhead of the top arrow.