Questions on Algebra: Linear Algebra (NOT Linear Equations) answered by real tutors!

Tutors Answer Your Questions about Linear Algebra (FREE)

Question 294674: i need help solving this equation its 4.00x+6.00y=2340, x+y=480
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Question 295105:

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Question 295104:
What is the remainder?
A. -2
B. -1
C. 0
D. 1
E. 2
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Question 295731: e. This equation illustrates your remaining funds after paying for rent and utilities. How much money is left? Explain how you arrived at your answer.
$38,250 + $80,000+ $22,250-0.25($80,000 + $38,250) = $110,937.50

How do I put this in algebraic form?
Click here to see answer by richwmiller(9143)

Question 296263: x1 x2 x3 s1 s2 z
3 3 2 1 0 0 12
2 1 2 0 1 0 14
-1 -1 -3 0 0 1 0
The initial tableau of a linear programming problem is given. Use the simple method to solve the problem
Can someone please help me. I think I got the wrong answer and not for sure.Thanks for your help.
Maximum at 6 for x3 = 2, s2 = 6
Answer choices are:
A)Maximum at 7 for x2 = 2, s1 = 2
B)Maximum at 21 for x2 = 2, x3 = 6
C)Maximum at 18 for x3 = 6, s2 = 2
D)Maximum at 8 for x3 = 3, s2 = 6
Click here to see answer by richwmiller(9143)

Question 296611: Hi
there are 2 rental car companies,
1) offering a car for $100pw including 100km for free & then 11c per km
2) offering a car for $75pw including 150km for free & then 15c per km
at what point will the 2 be the same cost?
thank you so much for your help
Sam
Click here to see answer by richwmiller(9143)

Question 297108: x-7y=4
-3x+2y=6
solve by substitution
Click here to see answer by user_dude2008(1861)

Question 297273: (sqrt(2x-9))+4=3
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Question 297678: what does 3x+12 equal
Click here to see answer by Fombitz(13828)

Question 297745: Construct a truth table for (~p q) p
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Question 298286: THis is a linear systems of equations. SOlve the linear system. Trying to figure out the steps. THanks. :
x+2y+3z=7
-x+2y-z=1
-x+y-2z=-2
Click here to see answer by amoati(11)

Question 298315: I am attempting to solve this problem and would appreciate some help:

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Question 298691: 6^2/6^4 solve this problem.

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Question 298101: Suppose A is a 2*2 matrix where the sum of each of the columns is equal to 0. Prove that A in not invertible.
Click here to see answer by user_dude2008(1861)

Question 298073: Hey I've tried this 3 times and I keep getting stuck halfway through it. Could someone please take me through the steps.
z = f(x,y) of x and y, which has partial derivatives: dz/dx = 2xy and dz/dy = x^2
given the relations: r = sqrt(x^2+y^2) and theta = arctan (y/2)
x = r cos (theta) and y = r sin (theta)
find dz/d(theta) (expressed in terms of r and theta)
Click here to see answer by user_dude2008(1861)

Question 298800: Solve by elimination
5x-y=13
x+2y=1

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Question 298800: Solve by elimination
5x-y=13
x+2y=1

Click here to see answer by nerdybill(6959)

Question 298800: Solve by elimination
5x-y=13
x+2y=1

Click here to see answer by profemmanuel2q(4)

Question 298877: 10n+10 over n+1
Click here to see answer by user_dude2008(1861)

Question 298928: I need to explain this problem in essay form
4(x+7)-10=6(x-2)+8
Click here to see answer by mananth(12270)

Question 299455: For each system find the values of a and b so that the solution set to the system is {(5, 12)}.
y=3x+a
y=-2x+b
I have been working through similar problems but I am stuck with this one. I really have no clue how to solve this particular one. Can you help me?
Click here to see answer by jim_thompson5910(28595)

Question 299703: If f(x) = x - 1, what is the value of x that satisfies the equality f(x) - 1 = f(x^2)- x^2
Click here to see answer by mathitutor(25)

Question 300204: A tractor that 4 years ago cost $8000, is now worth only $3200. Find the average annual rate of depreciation.
Thank You!

Click here to see answer by mananth(12270)

Question 300359: 9^(2x-1)=27^(x+4)
Click here to see answer by Fombitz(13828)

Question 300356: What is the solution to the inequality shown in the problem?
-1 + b>_ 9
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Question 301368: f(x) = |x| and g(x) = x - 1. How many solutions x satisfy f(x) = g(x)?
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Question 301470: Given two points on the line, input the equation of the line in standard form Ax + By = C. Reduce all fractional answers to lowest terms.
(6, 1), (5, 4)

Click here to see answer by Alan3354(30993)

Question 301469: Given two points on the line, input the equation of the line in standard form Ax + By = C. Reduce all fractional answers to lowest terms.
(7, -3), (4, -8)

Click here to see answer by Alan3354(30993)

Question 302482: A cruise boat travels 48 miles downriver in 4 hours and returns to its starting point upriver in 12 hours. Find the speed of the river.
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Question 303178: use synthetic division to divide x^4+4x^3+6x^2+4x+1 by x+1
Click here to see answer by CharlesG2(828)

Question 303213: Please help to solve this equation:
6x+4y+z=40
Find out the value of x, y & z.

Click here to see answer by blwinbbbles(106)

Question 303311: write the interval notation for the set {x|-3>x>5}
Click here to see answer by Fombitz(13828)

Question 305981: solve the following formula for the indicated variable
A=1/2 (B+b)h
solve B
Click here to see answer by texttutoring(324)

Question 305989: solve the linear inequality
3z-1 > (or equal to) 3+5z
Click here to see answer by checkley77(12569)

Question 307041: The half-life of C-12 is about 3,700 years. How long will it be before a 2.35g sample of C-12 decays to 1.46g of C-12?
I have no clue...please help.
Thank You
Click here to see answer by scott8148(6628)

Question 307140: how does (n-3)^2 = n^2-6n+9 ????? please help
Click here to see answer by Stitch(352)

Question 307444: what can be said of points with equal abscissa? with equal ordinates?
Click here to see answer by rapaljer(4667)

Question 307453: what do points on the parallel to x-axis 5 units above it have in common?
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Question 307615: A cable car is carrying passengers down a hill at a downgrade of 12%. if the passengers descend 1,250 feet, through what horizontal distanve have they travelled?
Click here to see answer by ankor@dixie-net.com(15652)

Question 307760: with a fixed cost of $4000, 20 items cost a total of $10,000, find a linear cost function
Click here to see answer by rapaljer(4667)

Question 308315: 21x+7<3x+16
Click here to see answer by checkley77(12569)

Question 308566: How many Pure acid must be mixed with 60 liters of a solution that is 65% acid to obtain a new solution that is 75% acid?
Click here to see answer by mananth(12270)

Question 308636: Name the set(s) of numbers to which 1.68 belongs.

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Question 308645: 2(5-3x)=1/16
Click here to see answer by Alan3354(30993)

Question 308646: e2x=4
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