Use words, pictures, or numbers, make a math arguement.

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)

Need this asap if anyone can i would be very grateful. if you could show workings that would really

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?