Final answer:
The provided information is insufficient to accurately determine the coordinates of E, calculate the length of c, or express g(x)-f(x). More details about the specific functions and context are required.
Step-by-step explanation:
To determine the coordinates of E, calculate the length of c, write an expression for g(x)-f(x), and find out for which value of x is g(x)>f(x), more information is needed that specifically relates to the functions g(x) and f(x), as well as the context of coordinates and length described. Unfortunately, the provided text is disjointed and seems to refer to different scenarios, none of which provide enough detail to accurately determine the coordinates of E or calculate the length of c. Additionally, without specific information about the functions g(x) and f(x), it is not possible to write the expression for g(x)-f(x) or to find out for which values of x g(x) is greater than f(x).