Answer:
A.
Step-by-step explanation:
All of the metric systems of measurement are base 10. What this means is that for every 10 of something, you get the next level of that. For instance, 10mm = 1cm.
What the United States uses for their measurement has random bases. For instance, 12 inches = 1 foot.
A because is adding then subtracting then diving but last of all multiple times).))/)/)/)