We have been given that :-
The length of a parasite in experiment A is ![2.5 \times 10^{-3}](https://tex.z-dn.net/?f=2.5%20%5Ctimes%2010%5E%7B-3%7D)
The length of a parasite in experiment B is ![1.25 \times 10^{-4}](https://tex.z-dn.net/?f=1.25%20%5Ctimes%2010%5E%7B-4%7D)
Let us write the the length of the parasite in experiment A in the exponent of -3.
![1.25 \times 10^{-4}= 0.125 \times 10^{-3}](https://tex.z-dn.net/?f=1.25%20%5Ctimes%2010%5E%7B-4%7D%3D%200.125%20%5Ctimes%2010%5E%7B-3%7D%20)
Clearly, the length of parasite in experiment A is greater than the length of parasite in experiment B.
The difference in the length is given by
![2.5 \times 10^{-3} -0.125 \times 10^{-4}](https://tex.z-dn.net/?f=2.5%20%5Ctimes%2010%5E%7B-3%7D%20-0.125%20%5Ctimes%2010%5E%7B-4%7D)
![=2.375 \times 10^{-3}](https://tex.z-dn.net/?f=%3D2.375%20%5Ctimes%2010%5E%7B-3%7D)
Therefore, the length of the parasite in experiment A is
inches greater than the length of the parasite in experiment B.