# Suppose you have 30 CDs. You know that you have 11 more CDs than your friend. How do you write and solve an equation to find the number of CDs your friend has?

A simple equation would be:

My friend, therefore, has

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Let x represent the number of CDs your friend has.

Equation: x + 11 = 30

Solution: x + 11 = 30 x = 30 - 11 x = 19

Your friend has 19 CDs.

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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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