$\text { Consider the function } f ( x ) = 8 x - x ^ { 2 } \text { and the point } P ( 3,15 ) \text { on the }$

Multiple Choice

$\text { Consider the function } f ( x ) = 8 x - x ^ { 2 } \text { and the point } P ( 3,15 ) \text { on the }$ graph of $f$ . Estimate the slope of the tangent line of $f$ at $P ( 3,15 )$ .

A) 10
B) 3
C) 8
D) 2
E) 9