1.   Express 0.0000421 in scientific notation.
    A. 4.21 × 10-6 B. 4.21 × 10-5
    C. 4.21 × 10-4 D. 4.21 × 10-9
    Hint

  2.   Simplify (7a4b) (8a7b6).
    A. 15a28b6 B. 56a11b7
    C. 15a11b7 D. 56a28b6
    Hint

  3.   Simplify (3a4b5c)4.
    A. 12a8b9c5 B. 7a16b20c4
    C. 81a16b20c4 D. 3a16b20c4
    Hint

  4.   Evaluate . Express the result in scientific notation.
    A. 8.0 × 10-9 B. 8.0 × 10-7
    C. 0.8 × 10-8 D. 80 × 10-8
    Hint

  5.   Which number is not equal to the other three?
    A. B.
    C. D. 2-2
    Hint



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