# How do you write a variable expression for the word phrase "the sum of 9 and a number"?

In math, any number you don't know - and/or want to find can be named after whatever you want, but there are some conventions.

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The variable expression for the phrase "the sum of 9 and a number" is ( 9 + x ), where ( x ) represents the unknown number.

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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.

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