Someone me. i tried to solve it but couldn’t

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 term makes it inconsistent y=2x - 4

The volume of a cube is 8 in to the 3rd power. how long is each side?