Answer:
![18.5\operatorname{cm}]()
Step-by-step explanation:
Given that today the plant is 5 cm high.
![h_0=5\operatorname{cm}]()
the plant grows 1.5 per day;

Let x represent the number of days;
The height of lynn's plant after x days is;

after 9 days;

substituting;
![\begin{gathered} h=1.5(9)+5 \\ h=18.5\operatorname{cm} \end{gathered}]()
Therefore, lynn's plant is 18.5 cm tall after 9 days,