Which number line correctly shows 1. 5 + 2. 5? A number line going from 0 to 6. 5 in increments of 0. 5. An arrow goes from 0 to 1. 5 and from 1. 5 to 4. A number line going from 0 to 6. 5 in increments of 0. 5. An arrow goes from 0 to 1. 5 and from 1. 5 to 3. A number line going from 0 to 6. 5 in increments of 0. 5. An arrow goes from 0 to 2. 5 and from 2. 5 to 5. A number line going from 0 to 6. 5 in increments of 0. 5. An arrow goes from 1. 5 to 3 and from 3 to 5. 5.