11 articles trouvés pour ce sujet.
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A system of linear equations |
2016-01-24 |
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kareem pose la question :
my name is kareem
and i am a student i have a math puzzle and i tried to solved it but it always have same mistake
x-y=9
x+z=12
z-n=14
y+n=2
Penny Nom lui répond. |
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An algebra exercise |
2007-01-24 |
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Clara pose la question :
Given x + 2y = -2 and x - 2y = 18, find:
a) x^2 - 4y^2
b) x^2 + 4y^2
Stephen La Rocque and Penny Nom lui répond. |
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Mr.Carter is very cautious |
2003-11-26 |
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Bob pose la question :
Mr.Carter is very cautious. He decides to invest in only three stocks: one low stock, one high stock, one medium stock. Given that the expected annual yields are 6% for low stock, 7% for medium stock, and 8% for high stock, he wants his investment in medium stock to be half of his total investment in low and high stock. How much should I invest in each type fo stocks to expect a total annual return fo $650 form my investments?
Harley Weston lui répond. |
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Two equations |
2002-07-26 |
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Derek pose la question :
1. 3x + 2y = 4
2. -7x + 2y = 24 finding x and y.
Penny Nom lui répond. |
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An augmented matrix |
2002-04-20 |
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A student pose la question :
Hi my math teacher asked us to solve an augmented matrix. I am in twelfth grade and need help. The book we are working on is college algebra. Here it is a+2b+c=0
2a+5b+4c=-1
a-b-9c=-5
Penny Nom lui répond. |
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Pairs of equations |
2002-04-04 |
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A student pose la question :
high school level
student is asking
y=4x x=-4y
x+y=5 3x+2y=20
y=x-1 3x-y=4
x+y=3 2x-3y=-9
x+5y=4
3x+15y=-1
. . .
Penny Nom lui répond. |
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Two linear equations |
2000-09-14 |
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David Dean pose la question :
2a + 1b = 3.39 3a + 3b = 6.59
What formula do I use to find what a = ?
Harley Weston lui répond. |
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The equation of a parabola |
2000-05-22 |
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Ian Forsyth pose la question :
Given the points A(0,0) B(60,10) C(24,d) find the equation of the parabola. leave the equation in terms of x, y and d if the general form of a quadratic is y = ax2 + bx + c.
Penny Nom lui répond. |
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A matrix equation |
2000-05-14 |
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A student pose la question :
Right now, we are dealing with matrices and we are supposed to solve the following problem on our graphing-calculators: 2a+3b-4c+d=20
a-2b+3c-5d=-14
3a+4b-2c+3d=19
5a-b+6c+4d=-5
Penny Nom lui répond. |
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Taxis in Chicago |
2000-03-27 |
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A high school student high school student pose la question :
Suppose that taxis pick up and deliver passengers in Chicago, which is divided into three zones. Records kept by the drivers show that of the passengers picked up in Zone 1, 50% are taken to a destination in Zone 1, 40% to Zone 2, and 10% to Zone 3. OF the passengers picked up in Zone 2, 40% go to Zone 1, 30% to Zone 2, and 30% to Zone 3. Of the passengers picked up in Zone 3, 20% go to Zone 1, 60% to Zone 2 and 20% to Zone 3. Suppose that at the beginning of the day, 600 of the taxis are in Zone 1, 100 in Zone 2, and 300 in Zone 3. What is the distribution of taxis in the various zones after all have had two riders?
Harley Weston lui répond. |
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A system of equations in five unknowns |
2000-03-20 |
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Will pose la question :
I have been having some problem with the following question for some time. I would appreciate any help on solving the problem or a solution. Q: Assume that a system of equations in the unknowns x1, x2, x3, x4 and x5 when converted to row echelon form gives .
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Penny Nom lui répond. |
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