# What is the absolute magnitude of a type 1 cepheid variable star which has a period of 30 days?

The relationship is described by the equation -

Where *P* is in days

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A 30-day-period type 1 Cepheid variable star has an absolute magnitude of about -2.8.

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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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