# Eduardo thinks of a number between 1 and 20 that has exactly 5 factors. What number is he thinking of?

Answer is

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The reason for this is that while factors are always counted in pairs, they are multiplied by one in a square and only counted once (the square root).

Let's examine the other squares as a check:

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Eduardo is thinking of the number 16. It has exactly 5 factors: 1, 2, 4, 8, and 16.

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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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