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Barbatos666
The answer is d because if u multiple it u will get 9000

Answer:900

Step-by-step explanation:

8.1x10^9/9x10^6

step 1: make it turn into 81x10^8/9x10^6

step2: divide top and bottom by 10^6

81x10^2/9

step 3: divide top and bottom by 9

9x10^2 = 900