# Phillip bought 12 used CDs and DVDs. CDs cost $2 each, and DvDs cost $3 each. He spent $31, not including tax. How many DVDs did Phillip buy?

Phillip bought 7 DVDs

Now, we are able to write a few equations.

First, the quantity of goods Phillip bought can be expressed as follows:

The price that Phillip paid for the goods is as follows:

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Phillip bought 6 DVDs.

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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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