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Math Help - Perimeter, Probability, and solving an expression

  1. #1
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    Perimeter, Probability, and solving an expression

    1. One side of a triangle is 4 cm longer than the shortest side and 2 cm shorter than the longest side. The perimeter is 38 cm. Find the dimensions of the triangle.

    2. A spinner with eight equal sections numbered 1 through 8 is spun 50 times. The number 3 is recorded 8 times. Determine the experimental probability of spinning an 8.

    3. Solve bx cx = 7 for x.

    Please..help. I would really appreciate it, i need it in soon. Reviewing for my exams.
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Power View Post
    1. One side of a triangle is 4 cm longer than the shortest side and 2 cm shorter than the longest side. The perimeter is 38 cm. Find the dimensions of the triangle.
    Side 1: x
    Side 2: x - 4
    Side 3: x + 2

    (x) + (x - 4) + (x + 2) = 38

    3x - 2 = 38

    3x = 40

    x = 13,333

    Quote Originally Posted by Power View Post
    3. Solve bx – cx = 7 for x.
    x(b - c) = 7

    x = \frac{7}{b - c}

    Quote Originally Posted by Power View Post
    Please..help. I would really appreciate it, i need it in soon. Reviewing for my exams.
    I know next to nothing about probability, but I'll read through that question again and see if I can make anything out
    Last edited by janvdl; January 26th 2008 at 10:07 AM. Reason: Minor mistake... :-D
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  3. #3
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    Thanks man, your reply helped me a lot in problem no. 2, I never thought of factoring out the x variable.

    But in problem 1, I still dont understand how can the sides equal the way you have them, can you please explain a little bit more.
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  4. #4
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Power View Post
    Thanks man, your reply helped me a lot in problem no. 2, I never thought of factoring out the x variable.

    But in problem 1, I still dont understand how can the sides equal the way you have them, can you please explain a little bit more.
    Remember in a triangle the perimeter = side 1 + side 2 + side 3

    Also one side has a value of x (We don't know what it is)

    But it's 4 cm longer than another side, so the latter must be x - 4

    Because it's 2 cm shorter than a third side, the third side must be x + 2
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