Answer:
The answer is C. a cylinder with a height of 6 cm and a radius of 12 cm
Step-by-step explanation:
I did it on the assignment
To let u know if it is either equal to or not
For this case we have that by definition, a linear function is of the form

We have the following options:
A) 
Rewriting:

It's a quadratic function!
B) 
Rewriting:

It's a linear function!
C)
Rewriting:

It's a cubic function.
D) 
Rewriting:

It's a quadratic function!
E)
Rewriting:

It's a cubic function!
Answer:
The linear function is option B