Simplify plz ! and explain how you got the answer

Can someone me out here number 4 plz

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

The equation represents the function f, and the graph represents the function g. f(x)=3(5/2)^x determine the relationship between the growth factors of f and g. a. the growth factor of g is twice the growth factor of f. b. the growth factor of f is twice the growth factor of g. c. the growth factor of f is 2.5 times the growth factor of g. d. the growth factor of f is the same as the growth factor of g.