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  1. a) 1.4 * 10^5 = 1.4 * 10 * 10 * 10 * 10 * 10= 140,000  km

    b) Mars has the smallest diameter (6,800 km). A helpful tip is to look at the exponents of the base; Mars' exponent is 3 which is the least.

    c) Diameter of Saturn - Diameter of Neptune

      = (1.2 * 10^5) - (5.0 * 10^4)

      = (120,000) - (50,000)

      = 70,000 km

    The difference between the diameter of Saturn and the diameter of Neptune is 70,000 km.

  2. 1. shade right, open circle

    2. no shade, solid circle

    3. shade right, solid circle

    4. shade left, solid circle

    5. no shade, solid circle

    6. shade left, solid circle

    7. shade left, open circle

    8. shade right, solid circle

    9. shade left, open circle

    10. no shade, solid circle

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