What is the answer to this problem I need help please?!

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 function has a range {yly< 5}? question on picture above^

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 120