# When is a relation a function?

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A relation is a function if each input value (domain element) is associated with exactly one output value (range element). In other words, for every input, there is only one corresponding output.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- Determine all integer pairs #(x,y)# with #x < y# such that the sum of all the integers strictly contained between then is equal #2016#?
- Given #f(x) = (2x-1)/(x-1) # how do you find f^-1(x)?
- How do you simplify #6(d - 8)#?
- What is the domain and range of # f(x)= (3x) /(x^2-1)#?
- How do you write an algebraic expression that models the word phrase "The total height of a 1-foot tall birdbath if it is placed on a base that is b feet tall"?

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