Ok I think you mean what is 6.4 divided by 0.8.
You can either use long division or a calculator. However since 6.4 divided by 0.8 is really the fraction 6.4/0.8 you can turn this into a much more simple problem.
Just

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Explanation:
Five hundred fifty-five thousandths is 555/1000 = 111/200, the ratio of two integers, hence a rational number.
Answer: D: 
Step-by-step explanation:


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Answer: Option a.
Step-by-step explanation:
1. The sequence shown in the problem is a Geometric sequence, because it has a common ratio. This means that when you multiply one of those numbers by the common ratio, you obtain the next number.
2. Then, you can calculate the common ratio as following:

3. Therefor, the next term is:

Answer:
Step-by-step explanation:
I DONT KNOW