Solve the Problem $x=a$ $f(x)=19-4 x, a=-4$
A) -4
B) 15
C) 16
D) -16

Solve the problem.
-Compute the instantaneous rate of change of the function at at $x=a$ . $f(x) =19-4 x, a=-4$ .

A) -4
B) 15
C) 16
D) -16