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

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Question 164842: As a homework problem, I am to construct a steel building 600 cu meters in size. My goal is to do it at the cheapest cost.
Bldg: W X L X H = 600 cu meters
Beams: $20W + $30L + $50H = Total Cost
I believe I have 4 unknowns, but I don't know how to set up the problem. Any help would be appreciated. THANK YOU!
Click here to see answer by MRperkins(83)

Question 164817: I have to find the least expensive cost for a steel frame building which measures 600 cu. meters. The prices of horizontal beams are 20d and 30w, vertical beams are 50h. Thank you.
Click here to see answer by Fombitz(2113)

Question 165205This question is from textbook College Algebra in Context
: Solve v=1^3pie r exponet 2h solve for hThis question is from textbook College Algebra in Context

Click here to see answer by Alan3354(6059)

Question 165251: solve each of the equation. indicate the LCD.
3/4x-1/2=5/8x
Click here to see answer by checkley77(7035)

Question 165259: solve each equation. indicate the LCD
6/(x^2+2) = 3/x
--------------------
LCD: x(x^2+2)
==================
Cheers,
Stan H.
Click here to see answer by stanbon(26259)

Question 165494: the problem:
Prove that (1,0,0,1) and (0,1,1,0) are linearly independent. I think they are dependent, am i missing something?
Click here to see answer by Fombitz(2113)

Question 165427: Farmer Ted can grow cotton and corn on his 200 acres of land.Cotton needs 15 lbs of fertilizer and 15 lbs of pestisides per acre. Corn needs 20lbs of fertilizer and 5 lbs of pestisides per acre. Farmer Ted can afford 3000 lbs of fertilzer and 1500 lbs of pestisides, and is trying to figure out how many acres of each crop to plant this season.
a. Define you varibles for this situation.

b. Use these varibles to write a system of inequalities describing the constraints on fertilzer and pestisides.
Click here to see answer by ankor@dixie-net.com(6691)

Question 166085: 2y(4-x)=x/2 where x =2
Click here to see answer by stanbon(26259)

Question 166191: suppose f(x)=3x-4 and g(x)=x+3.. find each value..
6. f(2)
7.f(1/3)+g(-2)
8.f(1)/g(1)
Click here to see answer by Mathtut(3670)

Question 166353: Solve by elimination.
-3+2y-5z=-3
3x-y+3z=4
3x+5y-8z=6
Click here to see answer by elima(1433)

Question 166496: I am lost on how to do to problems
1. f(x)=3x and g(x)=4x-3, find f[g(5)] and g[f(5)].
2. find the inverse of f(x)=7x-2.
Can you please help. I must show my work. These are from a worksheet. We have no textbook to use.
Thanks

Click here to see answer by stanbon(26259)

Question 166514: For x²(a-b)+a²(b-x)+b²(x-a) show that (x-a) is a linear factor.
PLEASE HELP ME!!!!!!
Click here to see answer by Edwin McCravy(2920)

Question 166514: For x²(a-b)+a²(b-x)+b²(x-a) show that (x-a) is a linear factor.
PLEASE HELP ME!!!!!!
Click here to see answer by ptaylor(1578)

Question 166495: State the number of positive real zeros, negative real zeros, and imaginary zeros for g(x)=9x^3-7x^2+10x-4.
I must show my work. This is from a worksheet and I'm not sure how to do it.
Thanks
Click here to see answer by stanbon(26259)

Question 166529: Solve:
3(x-2)^2=48
Click here to see answer by nerdybill(2446)

Question 166538: What is the sum of the roots of the equation
ax^2+bx+c=0
Click here to see answer by jim_thompson5910(13787)

Question 166538: What is the sum of the roots of the equation
ax^2+bx+c=0
Click here to see answer by stanbon(26259)

Question 166513: For x²(a-b)+a²(b-x)+b²(x-a) show that (x-a) is a linear factor.
PLEASE HELP ME!!!!!!
Click here to see answer by ankor@dixie-net.com(6691)

Question 166855: write an equation, then find the requested value of the variable.
if B varies inversely as t+2 and B=12 when t=1, find B when t=4
Click here to see answer by jojo14344(1483)

Question 166885: Help! Please! I already submitted these, but didn't get any answers. Thanks!
2/v - (3/v+1) x (v^2-1/v+4)
4x/x^2-3x-10 - 1/x^2+5x+6
A step -by-step would really be appreciated as this was done before I transferred to the class I don't really get it.

Click here to see answer by Alan3354(6059)

Question 166922: Approximate to the nearest tenth, the real root of the equation f(x)=x^3-4=0
Click here to see answer by checkley77(7035)

Question 167433: find the lope, the slope point form, slope intercept form, and standard form of the equation through the points (-5,6)(3,10) for slope intercept and standard form
Click here to see answer by jojo14344(1483)

Question 167430: y-8=3/4(x-2)
Click here to see answer by jojo14344(1483)

Question 167501: point slope (3,5)
Click here to see answer by Mathtut(3670)

Question 167817: Solve each system by the addition method.
x + y = 7
X – y = 9

x – y = 12
2x + y = 3

2x – y = -5
3x + 2y = 3

3x + 4y = -5
5x + 6y = -7
Click here to see answer by nerdybill(2446)

Question 167817: Solve each system by the addition method.
x + y = 7
X – y = 9

x – y = 12
2x + y = 3

2x – y = -5
3x + 2y = 3

3x + 4y = -5
5x + 6y = -7
Click here to see answer by checkley77(7035)

Question 167814: Solve each system by the substitution method.
3x + y = 2
-x – 3y = 6

Click here to see answer by salvyb(3)

Question 161146: CAN SOMEONE PLEASE HELP ME WITH THIS PROBLEM:
Find the appropriate linear cost or revenue function.
An electrician charges a fee of $60 plus $45 per hour. Let C(x) be the cost in dollars of using the electrician for x hours. Find the linear cost function.
Click here to see answer by Alan3354(6059)

Question 168641: Please help me solve this equation:
Using a System of 3 equations.
9.) Gina sells magazines part time. On Thursday, Friday, and Saturday, she sold $66 worth. On Thursday she sold $3 more than on Friday. On Saturday She sold $6 more than on Thursday. How much did she take in each day?
Click here to see answer by stanbon(26259)

Question 168651This question is from textbook Prentice Hall Algebra 2 with trigonometry
: Please help me solve this equation:
Using a System of Three equations.
10.) Pat picked strawberries on three days. he picked a total of 87 quarts. on tuesday he picked 15 quarts more than on monday. on Wednesday he picked 3 quarts fewer than on tuesday. How many quarts did he pick each day?
This question is from textbook Prentice Hall Algebra 2 with trigonometry

Click here to see answer by Mathtut(3670)

Question 168836This question is from textbook Prentice Hall Algebra 2 with Trigonometry
: Please help me solve this equation:

numeric word problem using 3 equations.
The sum of three number is 105. The third is 11 less than 10 times the second. Twice the first is 7 more than three times the second. Find the NumbersThis question is from textbook Prentice Hall Algebra 2 with Trigonometry

Click here to see answer by Mathtut(3670)

Question 168846This question is from textbook Prentice Hall algebra2 with trigonometry
: Please help me solve this equation:
Number solving Using three equations:
Kristen has a total of 225 on three tests. The sum of the scores on the first and second tests exceeds her third score by 61. her first score exceeds her second by 6. Find the 3 scores.This question is from textbook Prentice Hall algebra2 with trigonometry

Click here to see answer by scott8148(3382)

Question 168860This question is from textbook prentice hall Algebra2 with trigonometry
: Please help me solve this equation:
using a system of two equations:
Soybean is 16% protein and corn meal is 9% protein. How many pounds of each should be mixed toghther to get a 350-lb mixture that 12% protein?This question is from textbook prentice hall Algebra2 with trigonometry

Click here to see answer by checkley77(7035)

Question 169249: Solve the following system of nonlinear equations.
2xy=3
4x^2-8y^2=1
Click here to see answer by Alan3354(6059)

Question 169252: I solved 48 problems but this one has me stumped and I have been working on it for 2hrs.
Solve the following system of nonlinear equations.
x^2 + y^2 = 3
x^2 + y = 0
Click here to see answer by Earlsdon(4898)

Question 169460: what is the difference between linear graphs and inequalities
Click here to see answer by Mathtut(3670)

Question 169467This question is from textbook elementary linear algebra
: the question is on page 40This question is from textbook elementary linear algebra

Click here to see answer by Alan3354(6059)

Question 169959: Help me solve each system by the substitution method:
y=x^2-4x-10
y=-x^2-2x+14
Click here to see answer by Alan3354(6059)

Question 170216This question is from textbook beginning and intermediate algebra
: 4x+3z=4
2y-6z=-1
8x+4y+3z=9

first i added equations 1 &2, But since the equations don't have the same variables i substituted the missing variables with zero.
4x+0y+3z=4
0x+2y-6z=-1 my answer was 8x+2y=7 i canceled the z's. i still could not get the anwer right. Please help. This question is from textbook beginning and intermediate algebra

Click here to see answer by Edwin McCravy(2920)

Question 170610: can u help me our e-mail me an website to solve linear equations
Click here to see answer by Alan3354(6059)

Question 170750This question is from textbook algebra and trigonometry

: The sum of two numbers is 20. The difference of their squares is 120. What are the numbers?This question is from textbook algebra and trigonometry

Click here to see answer by checkley77(7035)

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