11 items are filed under this topic.
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A system of linear equations |
2016-01-24 |
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From kareem:
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
Answered by Penny Nom. |
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An algebra exercise |
2007-01-24 |
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From Clara:
Given x + 2y = -2 and x - 2y = 18, find:
a) x^2 - 4y^2
b) x^2 + 4y^2
Answered by Stephen La Rocque and Penny Nom. |
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Mr.Carter is very cautious |
2003-11-26 |
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From Bob:
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?
Answered by Harley Weston. |
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Two equations |
2002-07-26 |
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From Derek:
1. 3x + 2y = 4
2. -7x + 2y = 24 finding x and y.
Answered by Penny Nom. |
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An augmented matrix |
2002-04-20 |
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From A student:
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
Answered by Penny Nom. |
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Pairs of equations |
2002-04-04 |
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From A student:
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
. . .
Answered by Penny Nom. |
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Two linear equations |
2000-09-14 |
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From David Dean:
2a + 1b = 3.39 3a + 3b = 6.59
What formula do I use to find what a = ?
Answered by Harley Weston. |
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The equation of a parabola |
2000-05-22 |
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From Ian Forsyth:
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.
Answered by Penny Nom. |
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A matrix equation |
2000-05-14 |
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From A student:
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
Answered by Penny Nom. |
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Taxis in Chicago |
2000-03-27 |
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From A high school student high school student:
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?
Answered by Harley Weston. |
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A system of equations in five unknowns |
2000-03-20 |
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From Will:
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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Answered by Penny Nom. |
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