Help i’m begging

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

What’s the range cuz i can’t find it?

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3