No, they are not.
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It's C. In order to be in standard form you have to have all your exponents in descending order. They don't all have to be there in order, the ones that are just have to go from highest to lowest.
Answer:
square root of 81
Step-by-step explanation:

so 9 is rational number.
the rest are irrational number
Answer:
I think that the best unit rate is Grande: 16oz ; $4.25