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Math Help - Math B regents help

  1. #1
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    Math B regents help

    I'm going to be taking the Math B regents soon and I am taking practice test. I'm currently doing the 2004 August regents and I managed to get the answers online to check my work. However, the key only says the answers and doesn't show any of the work. Can someone please show me what to do for numbers 25,26,27,30,31,33 and 34? Here is the site with all the questions. Thank you.
    http://www.nysedregents.org/testing/...mathbaug04.pdf
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by badandy328 View Post
    I'm going to be taking the Math B regents soon and I am taking practice test. I'm currently doing the 2004 August regents and I managed to get the answers online to check my work. However, the key only says the answers and doesn't show any of the work. Can someone please show me what to do for numbers 25,26,27,30,31,33 and 34? Here is the site with all the questions. Thank you.
    http://www.nysedregents.org/testing/...mathbaug04.pdf
    Here's 25
    Attached Thumbnails Attached Thumbnails Math B regents help-quest25.gif  
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by badandy328 View Post
    I'm going to be taking the Math B regents soon and I am taking practice test. I'm currently doing the 2004 August regents and I managed to get the answers online to check my work. However, the key only says the answers and doesn't show any of the work. Can someone please show me what to do for numbers 25,26,27,30,31,33 and 34? Here is the site with all the questions. Thank you.
    http://www.nysedregents.org/testing/...mathbaug04.pdf
    Here's 26
    Attached Thumbnails Attached Thumbnails Math B regents help-quest26.gif  
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  4. #4
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    Thanks. I managed to firgure out the graphing ones. All i need now is the work for 26,27,30 and 31.
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by badandy328 View Post
    I'm going to be taking the Math B regents soon and I am taking practice test. I'm currently doing the 2004 August regents and I managed to get the answers online to check my work. However, the key only says the answers and doesn't show any of the work. Can someone please show me what to do for numbers 25,26,27,30,31,33 and 34? Here is the site with all the questions. Thank you.
    http://www.nysedregents.org/testing/...mathbaug04.pdf
    Here's 27
    Attached Thumbnails Attached Thumbnails Math B regents help-quest27.gif  
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by badandy328 View Post
    I'm going to be taking the Math B regents soon and I am taking practice test. I'm currently doing the 2004 August regents and I managed to get the answers online to check my work. However, the key only says the answers and doesn't show any of the work. Can someone please show me what to do for numbers 25,26,27,30,31,33 and 34? Here is the site with all the questions. Thank you.
    http://www.nysedregents.org/testing/...mathbaug04.pdf
    For 30, i can't really help you. I'm not that good at probability and so i don't want to attempt to help you with this one, however, here's the solution to 31.

    See the diagram below.

    Let the width of the original cardboard be x cm
    Then the length is x + 2 cm

    so the dimensions of the box created will be:
    height = h = 3 cm
    length = l = x - 4 cm
    width = w = x - 6 cm

    now we are told that the volume is 765 cm^3

    now volume = V = l*w*h
    => V = 3(x - 4)(x - 6) = 765
    => 3(x - 4)(x - 6) = 765
    => 3(x^2 - 10x + 24) = 765
    => 3x^2 - 30x + 72 = 765
    => 3x^2 - 30x - 693 = 0
    => x^2 - 10x - 231 = 0
    => (x - 21)(x + 11) = 0
    => x = 21 or x = -11
    x = -11 is impossible, so
    x = 21

    so, for the original cardboard, the dimensions are:
    length = x + 2 = 23 cm
    width = x = 21 cm
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  7. #7
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    Thanks man, you are the best!
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    is up to his old tricks again! Jhevon's Avatar
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    Tell me if i am correct, you have the answers right? i attempted question 30
    Attached Thumbnails Attached Thumbnails Math B regents help-quest30.gif  
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  9. #9
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    Hello, badandy!

    Here are a couple more . . .


    30. Tim Parker, a star baseball player, hits one home run for every ten times he is at bat.
    If Parker goes to bat five times during tonight's game,
    what is the probability that he will hit at least four home runs?
    This is a "binomial" probability problem.
    You're expected to be familiar with the formula.

    We are told that: .P(HR) = 0.1, .P(not) = 0.9

    "At least 4 home runs" means: 4 home runs or 5 home runs

    P(4 HRs) .= .C(5,4)(0.1)^4(0.9) .= .0.00045

    P(5 HRs) .= .(0.1)^5 .= .0.00001


    Therefore: .P(at least 4 HRs) .= .0.00045 + 0.00001 .= .0.00046



    34. The coodinates of quadrilateral KJLM are: J(1,-2), K(13,4), L(6,8), M(-2,4).
    Prove that quadrilateral JKLM is a trapezoid but not an isosceles trapezoid.
    I plotted the points to see what the quadrilateral looks like.
    Sides JK and LM look like they might be parallel.

    . . The slope of JK is: .[4 - (-2)]/[13 - 1] .= .6/12 .= .

    . . The slope of LM is: .[8 - 4]/[6 - (-2)] .= .4/8 .= .

    The slopes are equal: JK || LM. .JKLM is a trapezoid.


    If the two nonparallel sides have equal length, the trapezoid is isosceles.
    . . . . . . . . . . . . . . . . ________________ . . . . __
    The length of MJ is: . √(1 + 2) + (-2 - 4) .= .√45
    . . . . . . . . . . . . . . . . ________________ . - - .__
    The length of KL is: . √(13 - 6) + (4 - 8) .= .√65


    The two sides are not equal; the trapezoid is not isosceles.

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