Find a Formula for the Slope of the Graph Of f

Multiple Choice

Find a formula for the slope of the graph of $f ( x ) = 9 x ^ { 6 }$ .

A) $54 x$
B) $x ^ { 6 }$
C) $54 x ^ { 5 }$
D) $54 x ^ { 4 } ( x - 1 )$
E) $\infty$