8 x 10-3 is how many times as great as 4 x 10-6? 2 x 10-3 2 x 10 2 x 103 2 x 10-9 Done

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How do i do this activity, is appreciated

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum