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Algebra

The surface area of a cube can be found using the formula A = 6s^2 where A represents the surface area of the cube and s represents the length of one edge. My teacher wants me to draw a cube that has a length of at least 5 inches.

She also wants to know the independent variable
Along with notation to show domain and range

A = 6(5 inches)2
6(25 square inches)
150 sq. inches

Don't understand how to write domain and range

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Sue

  1. clearly, for a physical cube, the sides cannot be zero or negative. So, the domain is all positive real values:

    s > 0

    So, the range, 6s^2, is also all positive reals,

    A > 0

    Your teacher has further restricted the domain to

    s >= 5
    So, the range
    6s^2 >= 150

    In interval notation, that is
    domain: [5,∞)
    range: [150,∞)

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    Steve

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