Verified Answer :

  • - Step 1: Move the decimal point to the right, until you get greater then 1 and less than 10. In this case we moved it till we got 6.65.
    - - Step 2: Count how many times you moved the decimal over: In this case, we moved it 4 times.
    - - Step 3: All you have to do now is chose which one has 6.65 over -4.
     (We are saying negative because when you move it to the right, it becomes negative.)
    Final answer: A

a is the answer, 10^-4 means you move the decimal 4 places to the left

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