Answer:
24.
Step-by-step explanation:
We can use the factorial function to find the number of unique arrangements in a word.
There are 4 unique characters in 'OPAL'. As such, 4! = 24.
In the case that there were repeating characters, such as 'OPALA', then we would divide by the factorial of the number of repeating letters. That looks something like this:

Hope this helped.
Answer: No Real Answers
Step-by-step explanation:
1. Distribute
4x-8=4x+10
2. Get variables to one side add 8, subtract 4x)
0 = 18
3. Since this statement is false, the answer is... No real answers
Answer:
2:3
3:2
Step-by-step explanation:
Answer: 7 gallons decrease per minute
Step-by-step explanation:
56 gallons / 8 minutes = 7 gallons per minute
to make sure do it backwards: 7 gallons x 8 minutes = 56 gallons :)