Answer:
and 
and 
and
Step-by-step explanation:
Given
y varies inversely with x.
This is represented as:

Where k is the constant of proportionality.
(a): 
This gives:


-- the constant of proportionality.
To calculate the function, substitute 40 for k in 


This gives:


-- the constant of proportionality.
To calculate the function, substitute 33 for k in 


This gives:


-- the constant of proportionality.
To calculate the function, substitute 5000 for k in 
