Brianna's bookstore had 3 boxes of books. Each box contains an equal number of books the store sold six books and had 9 books left. How many books were in each box before any were sold A. 3
B. 2
C. 15
D. 5

(Help me pls)

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.