Answer:
a record of all the mail that a mailbox identifies as Junk
X^1/2 - x
-2x^3 - x^1/2 - x
-2x^3 - 2x
i think this is it
Unless I am misreading, the question, or don't know all of it, there can be an infinite number of similar shapes. Three are give to you at the bottom of this answer, but there are many more possibilities.
They can line up 20 different ways
This looks like an incomplete answer to me...
I cannot see any diagram or window or opening, or any lines that indicate they are line AC or BD.