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The set of people who answered this question before I did. There is only one empty set (a consequence of the Axiom of Extensionality). So the above answer is correct, and is equal to every other example.
A monomial is an algebraic expression with only one term. One example of a monomial is 4x. Other examples are 4x^2 or 8/y
No, that's one of the other simple machines.
If two lines in a plane are perpendicular, then one of the following applies:1) Either one line is horizontal (slope zero) and the other is vertical (slope undefined), 2) Or the product of their slopes is equal to -1. For example, one line might have a slope of 2, and the other, -1/2.
Only if each of the other maps is to the same scale as your example one. If not... no!