Question

the whole of a vicuna is thinner than any other will the hair of this animal can be as thin as 0.000006 is the average thickness of human hair is approximately 8.4 x 10 negative 5 / what is the difference of the thickness of a human hair and a vicuna hair

Answer 1

We can see that the point is located 6 units to the left, so the scientific notation for it is:

$8.4\cdot10^{-5}-6\cdot10^{-6}=7.8\cdot10^{-5}$

So, the difference is given by option D.