Assume the Ziders continue to grow in the same pattern. How old would a Zider be that had 73 hairs?

Number of hairs in day 1 , a = 5.

Every day number of hairs increases by , d = 4.

So, it is an Arithmetic Progression with first term a = 5 and common difference d = 4.

So, number of hair in nth days is given by :

Let, after x days number of hairs are 73.

Therefore, Zider is 18 days old.

Hence, this is the required solution.

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step-by-step explanation:

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step-by-step explanation:

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