 |
|
|
|
|
|
|
|
|
Sines & cosine laws |
1999-12-10 |
|
From Pierre Boivin:
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.
Answered by Chris Fisher. |
|
|
|
|
|
|
Les equations |
1999-12-09 |
|
From Enciso Alberto:
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.
.
.
.
Answered by Claude Tardif. |
|
|
|
|
|
|
Cubic meters to gallons |
1999-12-09 |
|
From Chris Compton:
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.
Answered by Harley Weston. |
|
|
|
|
|
|
Solve for v |
1999-12-09 |
|
From Beth:
1-3/4(v+2)=-5
Answered by Penny Nom. |
|
|
|
|
|
|
A calculus problem |
1999-12-08 |
|
From JT Wilkins:
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).
Answered by Penny Nom. |
|
|
|
|
|
|
Percentage change |
1999-12-08 |
|
From Michael Weinberg:
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.
.
.
.
Answered by Penny Nom. |
|
|
|
|
|
|
Advanced Calculus |
1999-12-07 |
|
From Kay:
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
- .
.
.
Answered by Claude Tardif. |
|
|
|
|
|
|
Inequalities and absolute values |
1999-12-07 |
|
From Austin Cline:
Solve for x: The absolute value of x-1 is less than or equal to the absolute value of x-2
Answered by Harley Weston. |
|
|
|
|
|
|
Mean, median and mode |
1999-12-07 |
|
From J William Morning:
Using the data values 2,2,10,6,5, determine the median, mode and mean.
Answered by Penny Nom. |
|
|
|
|
|
|
Two conics |
1999-12-07 |
|
From Quinn:
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
.
.
.
Answered by Penny Nom. |
|
|
|
|
|
|
Bases other than 10 |
1999-12-06 |
|
From Garret Magin:
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.
Answered by Claude Tardif and Patrick Maidorn. |
|
|
|
|
|
|
Systems of equations |
1999-12-06 |
|
From Roger Hornbaker:
I am having problem figuring out x and y solutions. - 5x + y = 4
3x - y = 4 - 3x + 2y = 6
- 3x + y = 0
Answered by Penny Nom. |
|
|
|
|
|
|
order 4+ determinants |
1999-12-06 |
|
From Joe Kron:
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.
Answered by Walter Whiteley. |
|
|
|
|
|
|
How many 3/5 are in 3/4? |
1999-12-06 |
|
From Whiteny:
How many 3/5 are in 3/4?
Answered by Penny Nom. |
|
|
|
|
|
|
Volume of an ellipsoid |
1999-12-06 |
|
From Michael Nowicki:
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.
Answered by Walter Whiteley. |
|
|
