Answer:
It can be assumed that the hair is 43 days old
Explanation:
Since the follicle of the hair is still intact, then we can assume that is the entire stretch of the hair.
If the air grows 0.44 mm per day, then we can say
0.44 ⇒ 1 day
19 ⇒ ?
? = 19 × 1/0.44
? = 43.18 ⇔ 43 days
It can be assumed that the hair is 43 days old
