Answer:
The height of the rock is 15 mm.
Explanation:
Given : Cristian put a large rock on the bottom of the terrarium he made for his pet turtle.
To find : How high is the rock?
Solution :
The rock is a right rectangular prism 10 cm wide by 12 cm long.
Let the height be 'h'.
The volume of the right rectangular prism is
![V=L* B* H](https://img.qammunity.org/2020/formulas/mathematics/college/an5947v1wvuhh2kguklmh79yh7qvqc8ef0.png)
i.e.
![V=10* 12* h](https://img.qammunity.org/2020/formulas/mathematics/middle-school/lw4e5cn0gi9q7u6sfycm4scqe9tz8e6892.png)
![V=120h](https://img.qammunity.org/2020/formulas/mathematics/middle-school/9i0lcqrcetbofc0r8hctdngtwz0jkg51b0.png)
The rock displaces 1800 cm³ of water.
i.e. The volume of the right rectangular prism is equal to the rock displaces of water.
So,
![120h=1800](https://img.qammunity.org/2020/formulas/mathematics/middle-school/kxthbl2bkhao4anj57pioralytgukuwolq.png)
![h=(1800)/(120)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/pyoqvzpvy2kthfbw2rshmx66se5jelz9b7.png)
![h=15](https://img.qammunity.org/2020/formulas/mathematics/middle-school/gd6wxuypjax8lozsnzh6nhz71msb3uw9be.png)
Therefore, the height of the rock is 15 mm.