Solution:
Given:
[tex]\begin{gathered} To\text{ find }(fg)(9),\text{ this means:} \\ (fg)(9)=f(9)\cdot g(9) \end{gathered}[/tex]
From the table,
[tex]\begin{gathered} f(9)=-4 \\ g(9)=-5 \\ \\ Hence, \\ (fg)(9)=f(9)\cdot g(9)=-4\times-5 \\ (fg)(9)=20 \end{gathered}[/tex]
Therefore, the answer is 20.
