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

Tutors Answer Your Questions about Linear Algebra (FREE)

Question 257940: Can someone please help a Soldier out here. I am not sure how to set up this problem.
Use the fundamental principles of counting or permutations to solve the problem.
An auto manufacturer produces 7 models, each available in 6 different colors, with 4 different upholstery fabrics, and 5 interior colors. How many varieties of the auto are available?
Click here to see answer by Greenfinch(383)

Question 258044: The raw scores on a test range from 22 to 78. The teacher would like to rescale the scores from 60 to 95. Find the linear function that will rescale the scores. What will a raw score of 45 be worth? What raw score will convert to a 90? (round to the nearest whole point)
Click here to see answer by stanbon(57307)

Question 258151: I need to know the x and y intercepts of the problem -x-y=2
Click here to see answer by richwmiller(9135)

Question 258151: I need to know the x and y intercepts of the problem -x-y=2
Click here to see answer by drk(1908)

Question 258389: Determine the shortest distance from (9,5) to 5x + 3y =15
Click here to see answer by stanbon(57307)

Question 258389: Determine the shortest distance from (9,5) to 5x + 3y =15
Click here to see answer by richwmiller(9135)

Question 246351: Please help me solve this linear system with three variables.
2x-y+2z=-21
x+5y-z=25
-3x+2+4z=6
I had attempted to replicate the example.
6x-3y+6z=-62
-6x+4y+8z=12
y+14z=40
3x+5y-3z=75
-3x+2y+4z=6
17y-z=81

Click here to see answer by Alan3354(30993)

Question 258778: 2x-4y=6
2x+y=1

my teacher said to solve this by using substitution but i keep getting the worng answer, help plz :)!
Click here to see answer by Fombitz(13828)

Question 258778: 2x-4y=6
2x+y=1

my teacher said to solve this by using substitution but i keep getting the worng answer, help plz :)!
Click here to see answer by richwmiller(9135)

Question 258777: 2x-4y=6
2x+y=1

my teacher said to solve this by using substitution but i keep getting the worng answer, help plz :)!
Click here to see answer by Fombitz(13828)

Question 258847: the equation is....1/6(x+12)+1=x/3
I believe i use the common denominator 6 to multiply each side?? If so, how do I multiply 6(x/3)?
thank you
gjvasquez@cox.net
Click here to see answer by Fombitz(13828)

Question 258682: Can you just give me how to start this problem -
Find the determinant of the matrix
1 1 1 - - - 1
1 2 2 - - - 2
1 2 3 - - - 3
- - - - - - -
1 2 3 - - - N

Would you expand the whole thing and solve??
Click here to see answer by Fombitz(13828)

Question 259170: Solve each system
x+z=0
x+y+2z=3
y+z=2
Click here to see answer by Fombitz(13828)

Question 259285: x + 2/5 = 2/3 I know the answer is 4/15 (used grade school math to solve it).
but I am having difficulty with the simplification of the lcd
Click here to see answer by richwmiller(9135)

Question 259708: how to solve 6x10exponent4-5000
Click here to see answer by checkley77(12569)

Question 259884: solve each quadratic equation using any technique name the technique -4x2 = 0
Click here to see answer by richwmiller(9135)

Question 259883: solve each linear equation using any technique name the technique 3x/4 + 6 = -12
Click here to see answer by rfer(12657)

Question 259945: (3x^2+2x-3)(x-10)
Click here to see answer by checkley77(12569)

Question 260560: How to sole
y=3x-5
y=-2x+5

Click here to see answer by onlinetutor365.com(14)

Question 260825: can you please add this (3b^2 + 4x -10)+(-b^2 +5x + 6)...oh and this is 12th grade algebra
Click here to see answer by Theo(3458)

Question 260825: can you please add this (3b^2 + 4x -10)+(-b^2 +5x + 6)...oh and this is 12th grade algebra
Click here to see answer by richwmiller(9135)

Question 260834: can you please add this (3b^2 + 4x -10)+(-b^2 +5x + 6)...oh and this is 12th grade algebra
Click here to see answer by stanbon(57307)

Question 260834: can you please add this (3b^2 + 4x -10)+(-b^2 +5x + 6)...oh and this is 12th grade algebra
Click here to see answer by richwmiller(9135)

Question 261601: find the slope of the line that passes through the given points
(2, -9) (3, -9)
Click here to see answer by richwmiller(9135)

Question 261910: Not sure if this is the right place. I have 2 questions:
1) bx - cx = -c How do I solve these? Thanks a lot!!!

2) 2/5 (x + 1) = g
Click here to see answer by richwmiller(9135)

Question 261930: 2/5 (x + 1) = g
Solve for x
Click here to see answer by checkley77(12569)

Question 261929: bx - cx = -c Solve for x
Click here to see answer by dabanfield(803)

Question 261929: bx - cx = -c Solve for x
Click here to see answer by checkley77(12569)

Question 262271: determine the poynomial whose graph passes through the points (-1,1), (0,-2), (1,0), and (2,-1)
Click here to see answer by solver91311(16877)

Question 262322: i need help i truly do not understand. and i do not want to flunk out of college because of not understanding alegabra. will you haelp me

Click here to see answer by richwmiller(9135)

Question 262388: im not sure how to do this =(
x=y+2
x=-7-7
Click here to see answer by drk(1908)

Question 262278: How are arithmetic sequences related to linear functions?
Click here to see answer by drk(1908)

Question 262917: PLease find the inverse of the matrix
-9 5
6 -3
Click here to see answer by jim_thompson5910(28555)

Question 262916: what is the value of the determinant?
3 6 8
2 4 0
3 6 8
Click here to see answer by jim_thompson5910(28555)

Question 263134: solve: 2/5x + 1/3 (x-4)= 1/5 (x-3)
Click here to see answer by drk(1908)

Question 263149: find the product:
(5+2i)(6-4i)
Click here to see answer by drk(1908)

Question 262930: Use determinants to determine the number of solutions for each of the following
system.
3x - y = -6
2x = 3y + 2
Click here to see answer by Alan3354(30993)

Question 262927: Using Cramer's rule solve
2x - y = 4
3x + y - z = 10
y + z = 3
Click here to see answer by jim_thompson5910(28555)

Question 263605: The power of i.
solve for i^25

Click here to see answer by drk(1908)

Question 263877: how many liters of 40% and 80% acids must be mixed in order to make 20 liters of a 55% acid soultion?
Click here to see answer by richwmiller(9135)

Question 264525: Solve the equation using factoring techniques
(x+5)^2-16=0
Click here to see answer by jim_thompson5910(28555)

Question 264863: 300x+100y+50z=800
20x+5y+5z=55
20y+44z=220
Click here to see answer by JBarnum(2044)

Question 264862: The sum of the average number of times a man, a woman, and a one-year old child cry each month is 71.7. A one-year old cries 46.4 more times than a man. The average number of times a one-year old child cries a month is 28.3 more than the average number of times combined that a man and a woman cry. What is the average number of times per month that each cries?
Click here to see answer by Theo(3458)

Question 264948: True or false questions:
1. In order for a matrix B to be the inverse of A, both equations AB=I and BA=I must be true.
2. Each elementary matrix is invertible
Click here to see answer by stanbon(57307)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510