Suppose that
f(x) = x^4 - 3 x^3 .

(A) List all the critical values of

(B) Use interval notation to indicate where

** Note: ** Use 'INF' for

Increasing:

(C) Use interval notation to indicate where

Decreasing:

(D) List the

(E) List the

Concave up:

(G) Use interval notation to indicate where

Concave down:

(H) List the

(I) Use all of the preceding information to sketch a
graph of

You can earn partial credit on this problem.