Sealed baby back pork loin ribs, use or freeze by date was 4 days ago. theyve been kept in the coldest part of the refrigerator; are they safe to cook and eat?

Yes, if you cook the food thoroughly, from the storage conditions you described, the food would be safe to eat. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV vaccine. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness

Probably OK, would inspect carefully for color, texture, smell, etc before use, well cooked only otherwise.