The picture is black so I can’t see the lines
Answer:
--- Length
--- Width
Step-by-step explanation:
Given
Let: 


Required
Find the dimensions of the rectangle
Area (A) is calculated as:

This gives:

Open bracket

Express as a quadratic function

Expand

Factorize:


This gives:


Width can not be negative.
So:


Recall that:



13.125, You would multiply the 3 values you were given to find the volume
The answer should be 1.425.
Once you subtract 0.3 from 6 it leaves you with 5.7
then do 5.7 divided by 4 and you would get 1.425