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

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Question 287677: What is the domain of g(x)=-3 over (2x-4)

Click here to see answer by richwmiller(17219)

Question 287681: A large three-topping pizza costs $15.60. For each additional topping, the cost increases by $2.00. To determine the coste of any large pizza, what slope shold be used to write the function?
Click here to see answer by richwmiller(17219)

Question 287679: Given f(x)=-2x to the 3 power and g(x)=4x-5, find g (f(-1))
Click here to see answer by stanbon(75887)

Question 287802: 3/(x+1) +4/(x-2)=(px+q)/(x+1)(x-2)
What is the value of p and q?

Click here to see answer by mananth(16946)

Question 288031: x+2y+3z=11
2x-y+4z=13
3x+4y-5z=3
Click here to see answer by richwmiller(17219)

Question 288473: a man has 20 coins consisting of dimes and quarters. if the dimes were quarters and the quarters were dimes, he would have ninety cents more than he has now. how many dimes and quarters does he have?
Click here to see answer by ankor@dixie-net.com(22740)

Question 288619: Given f(3)=12 and f(5)=-2, find f(one seventh).
a. 5 and one seventh
b. 18 and one seventh
c. 32
d. 34
Click here to see answer by richwmiller(17219)

Question 288616: Given f(x)=x to the second power+2 find f(a=2)-f(a)
a. 4a+4
b. 4a+8
c. 2
d. 4
Click here to see answer by user_dude2008(1862)

Question 288989: A warehouse manager is shipping an order made up of 2-pound and 5-pound bags of flour . The total weight of the order is 140 pounds . The equation below discribes this situation .
2x + 5y = 140
If the number of 2-pound bags ,x,is 30 , what is the number of 5-pound bags , y?
Click here to see answer by nyc_function(2741)

Question 289377: a motor boat goes 5 miles upstream in the same time it requires to go 7 miles downstream. if the river flows at 2 mph, find the speed of the boat in still water.
Click here to see answer by mananth(16946)

Question 289736: Soybean meal is 16% protein. Cornmeal is 8% protein. How many pounds of each should be mixed together in order to get 320- pound mixture that is 13% protein??
How many pounds of cornmeal?________
How many pounds of soybean meal??_______

Click here to see answer by ankor@dixie-net.com(22740)

Question 290998: help me solve those polynomials
x^3+21x^2=15x

Click here to see answer by richwmiller(17219)

Question 291828: how do you solve two equations with variables on both sides?
y + 1/2 = -1/3(x + 1/2)
Click here to see answer by richwmiller(17219)

Question 291929: What is the answer if you solve each system of equation by substitution?
4y+3x=-3
y=5x-5
Click here to see answer by richwmiller(17219)

Question 291929: What is the answer if you solve each system of equation by substitution?
4y+3x=-3
y=5x-5
Click here to see answer by stanbon(75887)

Question 290666: Q.1) 1.05=1(power1/n)
Click here to see answer by richwmiller(17219)

Question 292075: xy=6
xy+x+y=1
x=?
y=?
Click here to see answer by richwmiller(17219)

Question 294043: I have two questions:
Simplify [(x�)� ] / [(x�)�]
Click here to see answer by richwmiller(17219)

Question 294098: Factor x� - x.
Please help.
Click here to see answer by stanbon(75887)

Question 294140: Simplify (x�y1/2)�
Click here to see answer by Alan3354(69443)

Question 294168: Factor x�y - 4xy
Click here to see answer by Earlsdon(6294)

Question 294674: i need help solving this equation its 4.00x+6.00y=2340, x+y=480
Click here to see answer by richwmiller(17219)

Question 295105:

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Question 295104:
What is the remainder?
A. -2
B. -1
C. 0
D. 1
E. 2
Click here to see answer by richwmiller(17219)

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(17219)

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(17219)

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(17219)

Question 297108: x-7y=4
-3x+2y=6
solve by substitution
Click here to see answer by user_dude2008(1862)

Question 297273: (sqrt(2x-9))+4=3
Click here to see answer by Alan3354(69443)

Question 297678: what does 3x+12 equal
Click here to see answer by Fombitz(32388)

Question 297745: Construct a truth table for (~p q) p
Click here to see answer by user_dude2008(1862)

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:

Click here to see answer by richwmiller(17219)

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

Click here to see answer by nerdybill(7384)

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(1862)

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(1862)

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

Click here to see answer by user_dude2008(1862)

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

Click here to see answer by nerdybill(7384)

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(1862)

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(16946)

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(35256)

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(16946)

Question 300359: 9^(2x-1)=27^(x+4)
Click here to see answer by Fombitz(32388)

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