Which number line correctly shows 4. 5 + 2. 5? A number line going from 0 to 4. 5 in increments of 0. 5. An arrow goes from 0 to 4. 5 and then backwards from 4. 5 to 2. A number line going from negative 4. 5 to 0 in increments of 0. 5. An arrow goes from negative 4. 5 to negative 2 and then backwards from 0 to negative 4. 5. A number line going from negative 2. 5 to positive 4. 5 in increments of 0. 5. An arrow goes from negative 2. 5 to 0 and also from 0 to 4. 5. A number line going from negative 4. 5 to positive 2. 5 in increments of 0. 5. An arrow goes from 2. 5 to 0 and from 0 to negative 4. 5.