4/5 divided by 7/10 in fraction form help

Consider the functions below. function 1 function 2 function 3 select the statement which is true about the functions over the interval [1, 2] a b function 3 has the highest average rate of change function 2 and function 3 have the same average rate of change. function and function 3 have the same average rate of change function 2 has the lowest average rate of change d.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

What’s the range cuz i can’t find it?