<u>Answer:</u>
Approximately 377 cubic inches of water.
<u>Step-by-step explanation:</u>
We know that Mary wants to fill in a cylinder vase and she was told that the vase should be filled 3/4 for the flowers to last the longest. We are to find how much water should she pour into the vase.
So first, we will find the height of the water:
inches
Then, find the volume of the water of this height:
![Volume = \pi *4^2*7.5 = 376.9](https://tex.z-dn.net/?f=Volume%20%3D%20%5Cpi%20%2A4%5E2%2A7.5%20%3D%20376.9)
Therefore, Marry should pour approximately 377 cubic inches of water.