Algebra

Simplify and write in scientific notation.
(9 X 10^-3)^2

A. 8.1 X 10^-5
B. 81 X 10^-4
C. 81 X 10^-3
D. 8.1 X 10^-6

?

Evaluate 1/2a^-4 b^2 for a = -2 and b = 4.

A. 2
B. 1/2
C. 3
D. 4

B

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  1. 81 * 10*-6
    = 8.1 * 10^-5

    I have no idea. use parentheses or write it like this
    1
    -----------
    2 a^-4b^2

    or do you mean this?
    (1/2) a^-4 b^2

    or maybe
    1
    ------------- b^2
    2 a^-4

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    posted by Damon
  2. This one: (1/2) a^-4 b^2

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  3. that is
    b^2
    ------------
    2 a^4

    4^2
    --------
    2 (-2)^4

    16
    -------
    2(16)

    1/2

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    posted by Damon

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