There ain’t even T on the graph show the whole graph and maybe we can help you answer the question Karen
Answer: The volume of largest rectangular box is 4.5 units.
Step-by-step explanation:
Since we have given that
Volume = 
with subject to 
So, let 
So, Volume becomes,

Partially derivative wrt x and y we get that

By solving these two equations, we get that

So, 
So, Volume of largest rectangular box would be

Hence, the volume of largest rectangular box is 4.5 units.
First one is 7.73 (23.19/3)
Second one is 14.04 ((19.71/7.3) x 5.2)