X = -20p + 500
20p = 500 - x
p = (500 - x)/20
R = xp = x(500 - x)/20 = (500x - x^2)/20
I think K might be 0. Not sure.
Let the DVD = x
let the CD = y
x+y = cost
Yes.
This is the same thing as:

How many times can 6 go into 36?
6 times
Try:
6*6=36
So true.
Hope this helps! :D
Answer: It will be classified as a whole number!
Step-by-step explanation:
Hope this Helps!