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Math Help - Cubic and Quartic Functions Problems: Part 3

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    Exclamation Cubic and Quartic Functions Problems: Part 3

    I am having trouble with a couple of questions in terms of the proccess of solving the questions:
    4 A cuboid (recatangular prisim) has dimensions x metres, h metres and 4x metres. The cuboid is made of 640m of wire
    a Find h in terms of x
    b Find the volume, Vm^3 of the cuboid in terms of x
    c Find V when x = 11
    d Find the possible values of x for the cuboid to exist
    e Find the possible values of x when V = 60,000 (give 2 decimal places)
    f Find the max volume of the cuboid and the value of x for which it occurs

    That is a long list of questions, and I will be greatly apprecieated if any of you would have the time to help and explain these questions for me.
    Last edited by Chris L T521; April 26th 2011 at 11:16 PM. Reason: Splitting up original thread.
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    Quote Originally Posted by theleontan View Post
    I am having trouble with a couple of questions in terms of the proccess of solving the questions:
    4 A cuboid (recatangular prisim) has dimensions x metres, h metres and 4x metres. The cuboid is made of 640m of wire
    a Find h in terms of x
    b Find the volume, Vm^3 of the cuboid in terms of x
    c Find V when x = 11
    d Find the possible values of x for the cuboid to exist
    e Find the possible values of x when V = 60,000 (give 2 decimal places)
    f Find the max volume of the cuboid and the value of x for which it occurs

    That is a long list of questions, and I will be greatly apprecieated if any of you would have the time to help and explain these questions for me.
    1. Draw a sketch! (see attachment)

    2. The cuboid contains the edges x, 4x and h four times each. Since all edges together have a length of 640 m you already know:



    3. Now you're able to answer all your questions.
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