Can Someone please help me with this I don't understand it​

Find two rational expressions that have the difference of 2-n/n-4

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 is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?