# How do you define a variable and write an expression for each phrase: the total of four times a number and twice the difference between the number and four?

first phrase:

seconds phrase:

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To define a variable, you typically assign a letter to represent an unknown quantity. Let's use ( x ) for the number.

The expression for the total of four times a number and twice the difference between the number and four is:

[ 4x + 2(x - 4) ]

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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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