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Math Help - Math B regents

  1. #1
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    Math B regents

    I'm doing some practice regents to prepare for the test and i got stuck on a couple problems. Here's the link to the problems:http://www.nysedregents.org/testing/...hbtestja05.pdf and here's the link to the answers:http://www.nysedregents.org/testing/...hbscorja05.pdf What i need to know is the work required to find those answers. I need help on question 23,26,30,31,32 and 33. Thanks!
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  2. #2
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    please
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by badandy328 View Post
    I'm doing some practice regents to prepare for the test and i got stuck on a couple problems. Here's the link to the problems:http://www.nysedregents.org/testing/...hbtestja05.pdf and here's the link to the answers:http://www.nysedregents.org/testing/...hbscorja05.pdf What i need to know is the work required to find those answers. I need help on question 23,26,30,31,32 and 33. Thanks!
    23)
    i will use t to mean theta

    2sint - 1 = 0
    => 2sint = 1
    => sint = 1/2
    => t = arcsin(1/2)
    => t = pi/6, 5pi/6 for 0<= t <= 180


    26)
    the length of arc of a circle is given by the formula:
    s = rt

    where s is the length of the arc, r is the radius of the circle and t (which i substituted for theta) is the angle that subtends the arc in radians.

    we want to find the radius.

    => r = s/t = 6/1.5 = 4

    don't really have time to help you with the rest right now. someone else will help soon i believe, if not, i'll answer them later (probably tomorrow)
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  4. #4
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    k thanks, only need like 4 more.
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  5. #5
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    Ok, all i need right now is number 16, 32, and 33
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  6. #6
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    Quote Originally Posted by badandy328 View Post
    Ok, all i need right now is number 16, 32, and 33
    Number 16
    Attached Thumbnails Attached Thumbnails Math B  regents-save0011.jpg  
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  7. #7
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    Hello, badandy!

    #32 seems to be straight-forward.


    32) The number of people, y, who recycle in a community is modeled by the function:
    y .= .90√3x + 400, where x is the number of months the recycling plant has been open.

    Find the number of people who recycle exactly 3 months after the plant opened.
    Just let x = 3.
    . . . . . . . . . . . . . . ___
    We have: .y .= .90√33 + 400 .= .90(3) + 400 .= .670



    After how many months will 940 people be recycling?
    . . . . . . . . . . . . . . . . . . . .__
    We have the equation: .90√3x + 400 .= .940
    . . . . . . . .__
    Then: .90√3x .= .540
    . . . . . . . .__
    . . . . . . .√3x .= .6

    . . . . . . . .3x .= .36

    . . . . . . . . x .= .12

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  8. #8
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    #33
    Remember that a rhombus is a paralleogram with equal sides.
    To be a square is has to have a 90 degree angle, this is 2 sides perpendicular or the product of the slopes -1. As you going to see there is no 90 degree angle.
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  9. #9
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    Thanks guys. I said it once and I'll say it again. You guys truely are the best. Now if only ThePerfectHacker would stop giving me infractions.
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