The three single digit numbers multiply to make 504

Ineed to know the answer to this algebra question.

40 points. given: two congruent angles ∠c and ∠r are supplementary. prove: ∠r and ∠c are both right angles. it doesn't have to be exactly 10 rows. statements reasons1. 1. 2. 2. 3. 3. 4. 4. 5. 5. 6. 6. 7. 7. 8. 8. 9. 9. 10. 10.

If a + b = 4, what is the value of |4 – a| + |4 – b|?