Can someone me find the answer and find out how to get the answer for x, y, t, w, and z

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

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 are the domain and range of the function f(x)=2^x+1