# The ratio of my blue pens to my black pens is #7:2#; I add four more black pens to my collection. How many blue pens must I add to maintain the same ratio of blue to black?

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To maintain the same ratio of blue to black pens after adding four more black pens, you need to add ( \frac{7}{2} \times 4 = 14 ) blue pens.

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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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