I don’t understand these question

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

A. plot the data for the functions f(x) and g(x) on a grid and connect the points. x -2 -1 0 1 2 f(x) 1/9 1/3 1 3 9 x -2 -1 0 1 2 g(x) -4 -2 0 2 4 b. which function could be described as exponential and which as linear? explain. c. if the functions continue with the same pattern, will the function values ever be equal? if so, give estimates for the value of x that will make the function values equals. if not, explain why the function values will never be equal.