The answer is 5
Wait let me explain please
Using pythagoras rule
The horizontal 9-5=4
The vertical is 3-0=3
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![\begin{gathered} AB^2=3^2+4^2 \\ AB^2=9+16 \\ AB^2=25 \\ AB=\sqrt[]{25} \\ AB=5\text{ units} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/f4qzd20yffmwqu52e04vcodbf1l31awpgt.png)