Because they show exactly how much of something is there/needed.
Answer:
3 quarts = 3/4 gallon
Step-by-step explanation:
Answer:
680
Step-by-step explanation:
Use the binomial coefficient where you choose
numbers out of
possible numbers and find the total amount of combinations since order does not matter:

Thus, you can make 680 three-non-repeating-number codes
Well all i know is that whoever has all that bacteria, well good luck to them