Does 36/96 and 36/96 form a proportion? Yes or No??

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)

Is the number 128.439 a rational number

Ineed the solution to this problem and the steps.