Answer:
a) We get 
So, Is the result of A+B is a polynomial:Yes
b) We get 
So, Is the result of A-B is a polynomial:Yes
c) We get 
So, Is the result of A.B is a polynomial:Yes
Step-by-step explanation:
We are giving the polynomial equations:

We need to find
a) A+B

So, we get 
So, Is the result of A+B is a polynomial:Yes
b) A-B

So, we get 
So, Is the result of A-B is a polynomial:Yes
c) A . B

So, we get 
So, Is the result of A.B is a polynomial:Yes
Answer:
Step-by-step explanation:
x = ¼y
y - x = 12
y - ¼y = 12
¾y = 12
y = 16
x = ¼y = 4
You can fill up 4 tanks because 20 divided by 5 is 4