Answer: The difference in the amounts of water and rubbing alcohol Martina combined= 14 ml
Step-by-step explanation:
Given: Martina combined different amounts of water, vinegar, and rubbing alcohol to make 38 milliliters (ml) of a solution for a science experiment.
The amount of water was x ml.
The amount of vinegar was 8 ml less than that of water (x-8), and the amount of rubbing alcohol was half the amount of vinegar
.
This is represented in the equation :-

The amount of water x =20 ml
The amount of rubbing alcohol=
The difference in the amounts of water and rubbing alcohol Martina combined= 20-6 = 14 ml