Answer:
-4
Step-by-step explanation:
The average rate of change from x=a to x=b of f(x) is [tex]\frac{f(b)-f(a)}{b-a}[/tex]
The given function is [tex]f(x)=-5^{x-3}+2[/tex].
[tex]f(4)=-5^{4-3}+2=-3[/tex].
[tex]f(4)=-5^{3-3}+2=1[/tex].
The average rate of change from x=3 to x=4 is given by:
[tex]\frac{f(4)-f(3)}{4-3}[/tex]
[tex]\frac{-3-1}{4-3}=-4[/tex]