(please help ;-;) Which statement best summarizes a major theme of this passage(The Tell-Tale Heart by Edgar Allen Poe)?
A) Madness does not truly exist.
B) Madness leads to greater madness.
C) Madness can be devious and scheming.
D) There is a fine line between madness and sanity.

and your question what topic are you in trouble with?

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.