Hello,

you have $\displaystyle f(x)=\left\{\begin{array}{l}2x+3,x<4\\x-1,4<x<9\end{array}\right.$

I've attached the graph of this function.

From the grap you can see: The domain is $\displaystyle d=(-\infty,4)\ \cup\ (4,9)$. According to the wording of this problem the 4 doesn't belong to the domain.

The range is $\displaystyle r=(-\infty,11)$

There is one zeroat $\displaystyle x=-\frac{3}{2}$

EB