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Sines & cosine laws |
1999-12-10 |
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Pierre Boivin pose la question :
Triangle LMN, angle L=71 degree , LM= 7.2 , MN=8.3 , ln= 5.9 The questiion was to find angle M. Using the cosine law I found the answer to be 44 degree. It is also the book answer. Using the sines law I found the answer to be 42.2 degree. why can't I use the sines law.
Chris Fisher lui répond. |
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Les equations |
1999-12-09 |
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Enciso Alberto pose la question :
j'ai les equations suivantes: X1=Rs + A1/(B+W^2)
X2=Rs + A2/(B+W^2)
X3=Rd + A3/(B+W^2)
X4=Rd + A4/(B+W^2)
X5=Rg + A5/(B+W^2)
X6=Rg + A6/(B+W^2) dont les coefficients Ai (i=1,2,..) et B sont constants (mais on ne conais pas leur valeur) et Rs, Rd, et Rg sont inconnues. Nous pouvons constater que la dependence de ces differentes expessions en fonction de W^2 est identique. Le tracé de l'une de ces expressions en fonction d'une autre est donc une driote.
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Claude Tardif lui répond. |
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Cubic meters to gallons |
1999-12-09 |
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Chris Compton pose la question :
I am trying to convert cubic meters to gallons. Do you have the conversion formula? The problem I am trying to solve is: 59.62 cubic meters to gallons.
Harley Weston lui répond. |
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Solve for v |
1999-12-09 |
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Beth pose la question :
1-3/4(v+2)=-5
Penny Nom lui répond. |
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A calculus problem |
1999-12-08 |
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JT Wilkins pose la question :
These are the questions: - Show that there exists a unique function that meets the following requirements:
a) f is differentiable everywhere
b) f(0)= f'(0)= 0
c) f(x+y)= f(x)+ f(y), for all real values of x,y - Consider the function F: R-->R (All Reals)
F(x) = 0, for x irrational & 1/q, x=p/q gcd(p,q)=1 q > 0 a)determine the values x where f is continuous, respectively discontinuous.
b)determine the values x when f is differentiable and for each of these values compute f'(x).
Penny Nom lui répond. |
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Percentage change |
1999-12-08 |
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Michael Weinberg pose la question :
I am the Laboratory information system supervisor in a hospital. Our computer system calculates the change of specific results to monitor a patient's status. But there is a problem with the calculation in the base code of the program.
If one day the patient has a Blood count of 100 (P for Previous) then the next day the Blood count is 75 (C for current), the computer should calculate the change as -25% using the calculation |P-C|/P= D (D for Delta) and then check for positive or negative by the equation If P>C then D*-1 or If P The program is calculating using the equation: ((P/C)-1)*100 in the above situation this would calculate the Delta as 33.33333% Referenced in a Laboratory manual published before computers were used to calculate the delta changes.
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Penny Nom lui répond. |
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Advanced Calculus |
1999-12-07 |
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Kay pose la question :
Hi, my name is Kay. Please help---these problems are driving me crazzzzy!!!! Your help would be greatly appreciated! - Let a,b be contained in R, a
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Claude Tardif lui répond. |
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Inequalities and absolute values |
1999-12-07 |
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Austin Cline pose la question :
Solve for x: The absolute value of x-1 is less than or equal to the absolute value of x-2
Harley Weston lui répond. |
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Mean, median and mode |
1999-12-07 |
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J William Morning pose la question :
Using the data values 2,2,10,6,5, determine the median, mode and mean.
Penny Nom lui répond. |
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Two conics |
1999-12-07 |
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Quinn pose la question :
I know the formula to find the axis of symmetry of a conic section (I'm not sure what shape - circle for the first one??) is (-D/2A,-E/2C) but I obviously don't get how to calculate it, because when I check the answer it's wrong, but I'm so close!! For the following equations my teacher suggested to "divide the x term coefficient, D, by the x squared term coefficient before...do the same for y." 2x2+2y2-8x+12y+16=0
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Penny Nom lui répond. |
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Bases other than 10 |
1999-12-06 |
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Garret Magin pose la question :
We are doing a lesson on numbers of other bases than 10. We are working with binary, octal, and Hexadecimal. I was wondering what is used to represent number of different bases other then 16? Does it just continue on with the alphabet and if so what happens when you get to Z. It would be a help if you could answer this because it is really bugging me. And none of the math teachers at my school could let me know.
Claude Tardif and Patrick Maidorn lui répond. |
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Systems of equations |
1999-12-06 |
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Roger Hornbaker pose la question :
I am having problem figuring out x and y solutions. - 5x + y = 4
3x - y = 4 - 3x + 2y = 6
- 3x + y = 0
Penny Nom lui répond. |
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order 4+ determinants |
1999-12-06 |
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Joe Kron pose la question :
Why is it never shown how to calculate the value of 4x4 (or larger size) deteminants by the diagonal multiply methods that are generally shown for 2x2 and 3x3 determinants? The method I'm talking about is called Cramer's Rule??? Is this method not extensible to order 4+ and if not why not? Anyway the method always shown for order 4+ is called "reduction by minors" which is not the answer to this question.
Walter Whiteley lui répond. |
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How many 3/5 are in 3/4? |
1999-12-06 |
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Whiteny pose la question :
How many 3/5 are in 3/4?
Penny Nom lui répond. |
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Volume of an ellipsoid |
1999-12-06 |
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Michael Nowicki pose la question :
I am a physician at the University of Mississippi. I am trying to compare the size of polyps (abnormal growth of tissue in the colon) between 2 groups of individuals. The department of pathology gives the size as length X width X depth - how do I calculate the volume? Polyps are nearly ovoid in shape.
Walter Whiteley lui répond. |
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