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Math Help - final exam help >.<

  1. #1
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    Exclamation final exam help >.<

    i dont understand ---real numbers--- a question is ''name the set or sets of numbers to which the real number belongs'' -75/22

    and i dont understand ----''solve the equation then check your solution''
    4=-4(d+9) if a=/-2,4,9,0,6,3,1,2,-4/ b=/4,7,20,-8,2,15,12,-5,17/ c=/27,65,37,18,74,14/
    d=/-18,-48,-52,12,-36,36/
    and the next problem is d-c

    another this i dont understand is what the diffrence between odds and probability like that 2:1 or 1/3 chances

    this is one i dont get ''write a direct variable equation that relates x and y. assume that y varies directly as x. then solve.'' If y=-25 x=-5, find y when x=9

    what is a parrallel box-and-whiskers plot

    i would really really apreciate if anyone would help, my exam is coming and i understand most of everything else. please help
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  2. #2
    Senior Member ecMathGeek's Avatar
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    Quote Originally Posted by dipstik05 View Post
    ''name the set or sets of numbers to which the real number belongs'' -75/22
    Unless I'm misunderstanding the question, it belongs to:
    real numbers
    rational numbers
    Last edited by ecMathGeek; May 3rd 2007 at 11:23 AM.
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  3. #3
    Senior Member ecMathGeek's Avatar
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    Quote Originally Posted by dipstik05 View Post
    ''solve the equation then check your solution''
    4=-4(d+9) if a=/-2,4,9,0,6,3,1,2,-4/ b=/4,7,20,-8,2,15,12,-5,17/ c=/27,65,37,18,74,14/
    d=/-18,-48,-52,12,-36,36/
    and the next problem is d-c
    check to see if you wrote this problem correctly. As it's written, I don't think it has a solution.
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  4. #4
    Senior Member ecMathGeek's Avatar
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    Quote Originally Posted by dipstik05 View Post
    ''write a direct variable equation that relates x and y. assume that y varies directly as x. then solve.'' If y=-25 x=-5, find y when x=9
    If x varies directly with y, then we can say:
    x = K*y

    Since we know y = -25 when x = -5, we can solve for K:
    -5 = K*(-25)
    K = 1/5

    Now, the relationship between x and y becomes:
    x = 1/5*y

    To find y when x = 9, we plug in 9 and solve for y:
    9 = 1/5*y
    y = 45
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  5. #5
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    Quote Originally Posted by ecMathGeek View Post
    If x varies directly with y, then we can say:
    x = K*y

    Since we know y = -25 when x = -5, we can solve for K:
    -5 = K*(-25)
    K = 1/5

    Now, the relationship between x and y becomes:
    x = 1/5*y

    To find y when x = 9, we plug in 9 and solve for y:
    9 = 1/5*y
    y = 45
    thank you this helped me the most .. , but i dont understand rational numbers still how do u get that answer...
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  6. #6
    Senior Member ecMathGeek's Avatar
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    Quote Originally Posted by dipstik05 View Post
    thank you this helped me the most .. , but i dont understand rational numbers still how do u get that answer...
    You have to understand how rational numbers are defined.

    A rational number is any number that can be written as a quotient (a fraction) with an integer numerator and a non-zero integer denominator. In other words, if I delcare that n is a rational number then I can write n as:

    n = q/p

    where q and p are integers and p does not equal 0.

    Alternatively, a rational number is any number that has a terminating or repeating decimal. An example of a terminating decimal is 1.325 because the decimal stops at 5. An example of a repeating decimal is 6.66666... (where the 6's go on forever). Numbers like 103 and 3546987929.1 are also examples of terminating decimals. IF the number is NOT a terminating or repeating decimal number, THEN the number is NOT a rational number.

    Example: The number n = 1.2 is a rational number because it's a terminating decimal. Also 1.2 = 12/10, which is a fraction that contains only integers in the numerator and denominator.

    Example: The number n = 3 is a rational number because it is a terminating decimal. Also 3 = 3/1 which is a fraction with integers on the numerator and denominator.

    Example: The number n = 3.333333333.... (the 3's go on forever) is a rational number because it is a repeating decimal. Also it CAN be written as a fraction: 3.33333... = 10/3 , with an integer numerator and denominator.

    Example: The number n = sqrt(2) is NOT a rational number. (NOTE: the "sqrt" means "square root" which is a function that asks the question: what number times itself equals this number. The sqrt(4) is 2 because 2 times itself equals 4). The sqrt(2) cannot be written as a fraction and it is a number that has a decimal which never repeats or terminates.

    Notice that in your problem, the number is already written as a fraction: - 75/22. By the definition, this MUST be a rational number because its a fraction with integers in the numberator and denominator.
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  7. #7
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    Quote Originally Posted by ecMathGeek View Post
    You have to understand how rational numbers are defined.

    A rational number is any number that can be written as a quotient (a fraction) with an integer numerator and a non-zero integer denominator. In other words, if I delcare that n is a rational number then I can write n as:

    n = q/p

    where q and p are integers and p does not equal 0.

    Alternatively, a rational number is any number that has a terminating or repeating decimal. An example of a terminating decimal is 1.325 because the decimal stops at 5. An example of a repeating decimal is 6.66666... (where the 6's go on forever). Numbers like 103 and 3546987929.1 are also examples of terminating decimals. IF the number is NOT a terminating or repeating decimal number, THEN the number is NOT a rational number.

    Example: The number n = 1.2 is a rational number because it's a terminating decimal. Also 1.2 = 12/10, which is a fraction that contains only integers in the numerator and denominator.

    Example: The number n = 3 is a rational number because it is a terminating decimal. Also 3 = 3/1 which is a fraction with integers on the numerator and denominator.

    Example: The number n = 3.333333333.... (the 3's go on forever) is a rational number because it is a repeating decimal. Also it CAN be written as a fraction: 3.33333... = 10/3 , with an integer numerator and denominator.

    Example: The number n = sqrt(2) is NOT a rational number. (NOTE: the "sqrt" means "square root" which is a function that asks the question: what number times itself equals this number. The sqrt(4) is 2 because 2 times itself equals 4). The sqrt(2) cannot be written as a fraction and it is a number that has a decimal which never repeats or terminates.

    Notice that in your problem, the number is already written as a fraction: - 75/22. By the definition, this MUST be a rational number because its a fraction with integers in the numberator and denominator.
    thanks i understand now , last thing .. how can i use the quadratic formulas to factor ,,,,,,i dont get slope intercept i got most of the concepts of slope intercept but likehow do u write a equation in standard form and example like this ''find the line that passes through each point with the given slope.'' (1,-2) m=4 how do u solve somthing like this
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