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

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Question 1056335: Help solving this compound inequality. 4x+6≤-2 or 2x+2≥12. The greater than and less than symbols have a line under them which I don't know how to type in here. I have to also graph the solution on a number line.
Click here to see answer by Edwin McCravy(20054)

Question 1056353: Find the equations if the following lines
1. With m=-3 and passing through the point (-1,5)
2.Passing through the points (2,-3) and (-3,7)
3. With m= 5/2 and the y-intercept of 3
Click here to see answer by Fombitz(32388)

Question 1056885: Solve for x
8x^9=6x^6
Click here to see answer by Alan3354(69443)

Question 1056832: How many pairwise non-similar 3x3 diagonal orthogonal matrices are there?
Click here to see answer by ikleyn(52775)

Question 1057023: 2x-y=5 and 4x^2-y^2=15
Click here to see answer by ikleyn(52775)

Question 1057021: 4x-y=7 and xy=15 y=15/x 4x-(15/x)=7 multiply everything by x and get 4x^-7x-15=0 when you factor x=-5/4 and x=3

Click here to see answer by ikleyn(52775)

Question 1057021: 4x-y=7 and xy=15 y=15/x 4x-(15/x)=7 multiply everything by x and get 4x^-7x-15=0 when you factor x=-5/4 and x=3

Click here to see answer by MathTherapy(10551)

Question 1057021: 4x-y=7 and xy=15 y=15/x 4x-(15/x)=7 multiply everything by x and get 4x^-7x-15=0 when you factor x=-5/4 and x=3

Click here to see answer by jenny.rice(1)

Question 1057237: given A=
1 2 3 0 1
2 1 3 3 -1
1 5 2 5 4
is b=(1,0,1)T in the span of the columns of A?
is x=(1,1,1,1,1)T in the Null(A)?
Click here to see answer by ikleyn(52775)

Question 1057358: given a=
1 2 3 0 1
2 1 3 3 -1
1 5 2 5 4
is b=(1,0,1)T in the span of the columns of a? how do you solve this problem?
Click here to see answer by solve_for_x(190)

Question 1057358: given a=
1 2 3 0 1
2 1 3 3 -1
1 5 2 5 4
is b=(1,0,1)T in the span of the columns of a? how do you solve this problem?
Click here to see answer by rothauserc(4718)

Question 1057364: Carlos's gas tank is 1/2 full. After he buys 8 gallons of gas, it is 5/6 full. How many gallons can Carlos's tank hold?
Click here to see answer by Cromlix(4381)

Question 1057364: Carlos's gas tank is 1/2 full. After he buys 8 gallons of gas, it is 5/6 full. How many gallons can Carlos's tank hold?
Click here to see answer by ankor@dixie-net.com(22740)

Question 1057364: Carlos's gas tank is 1/2 full. After he buys 8 gallons of gas, it is 5/6 full. How many gallons can Carlos's tank hold?
Click here to see answer by MathTherapy(10551)

Question 1057497: What is the slope of the graph y=10^x at x=.6? Please help!
Click here to see answer by Fombitz(32388)

Question 1057497: What is the slope of the graph y=10^x at x=.6? Please help!
Click here to see answer by Alan3354(69443)

Question 1057636: 8 is greater than
y
, and
0
is less than or equal to
y

Click here to see answer by ikleyn(52775)

Question 1057566: Find a polynomial function whose graph passes through (-1,-11),(0,-6),(1,-3), and (2,4).
Click here to see answer by Fombitz(32388)

Question 1057916: Please help me.
Two water pipes together can fill a certain tank in 8.2 h. The smaller pipe alone takes 2.2 h longer than the larger pipe to fill that same tank. How long would it take the larger pipe alone to fill the tank? Keep three significant digits.
The larger pipe alone takes=
Click here to see answer by jorel555(1290)

Question 1057917: Please help me.
A truck travels 450 km to a delivery point, unloads, and, now empty, returns to the starting point at a speed 8.00 km/h greater than on the outward trip. What was the speed of the outward trip if the total round-trip driving time was 14.4 h? Keep three significant digits.
Upper R 1 =
km/h

Click here to see answer by jorel555(1290)

Question 1057921: Please help me.
A company buys a new pump that can pump 10.0 gal./min faster than its old one. It can fill the company's 500.0 gallon tank 15.0 minutes faster than the old pump. What was the speed of the old pump?
Round to three significant digits.
Click here to see answer by LinnW(1048)

Question 1058115: The marginal cost C(in dollars) to produce x bicycles is C(x)=x^2-40x+530,
Find the marginal cost of producing 40 bicycles
How many bicycles can be manufactured so that the marginal cost equals $130.
solve C(x)=130

Click here to see answer by stanbon(75887)

Question 1058114: X^x+y^y=31
X+y=5. Find x and y
Click here to see answer by stanbon(75887)

Question 1058114: X^x+y^y=31
X+y=5. Find x and y
Click here to see answer by Boreal(15235)

Question 1058114: X^x+y^y=31
X+y=5. Find x and y
Click here to see answer by ikleyn(52775)

Question 1058123: each side of a square garden patch is increased by 8 meters. if the area of the garden patch is now 4 times bigger than before what are the dimensions of the original garden patch ? (solve algebraically)
Click here to see answer by josgarithmetic(39616)

Question 1058124: Marginal cost can be thought of as the cost of producing one additional unit of output. the marginal cost C (in dollars) to produce x bicycles
is C(x)x^2-40x+530
(C)economic theory states that, to maximize profit, production should continue until marginal revenue equals marginal cost. assuming that marginal revenue equals $230, how much bicycles should be manufactured ?
Click here to see answer by josmiceli(19441)

Question 1058694: Factor by grouping
2ax^2-bx^2+4ay-2by
Click here to see answer by josgarithmetic(39616)

Question 1058694: Factor by grouping
2ax^2-bx^2+4ay-2by
Click here to see answer by MathTherapy(10551)

Question 1058856: find a formula for the least degree through the points (-4,0),(-2,-2),(1,0)
Click here to see answer by Alan3354(69443)

Question 1058856: find a formula for the least degree through the points (-4,0),(-2,-2),(1,0)
Click here to see answer by KMST(5328)

Question 1058949: Line QR goes through points Q(0, 1) and R(2, 7). Which equation represents line QR?
y�� 1 = 6x
y�� 1 = 3x
y�� 7 = 2x�� 6
y�� 7 = x�� 2
Click here to see answer by math_helper(2461)

Question 1059243: I am having trouble figuring out how to solve this problem.
Find all real solutions to the equation 40-106e^x+101e^2x-41e^3x+6e^4x=0.

Click here to see answer by ikleyn(52775)

Question 1059497: There are 25 coins in my pocket made up of nickels and quarters. I have a total of $3.25. How many each do I have?
Click here to see answer by Alan3354(69443)

Question 1059499: For a soccer game, there were 120 tickets sold for students and adults for a total of $195.00. If student tickets sold for $1.00 and adults for $2.00, how many of each were sold?
Click here to see answer by stanbon(75887)

Question 1060344: What is -6x+3y=-9
Click here to see answer by Fombitz(32388)

Question 1060344: What is -6x+3y=-9
Click here to see answer by Alan3354(69443)

Question 1060366: The sum of two squares of two numbers equal 265, and the difference of their squares is 23. Find the numbers.
Click here to see answer by Boreal(15235)

Question 1060718: Solve the system of equation.
28x-28y=3
-21x+21y=0
Click here to see answer by Fombitz(32388)

Question 1060734: Complete these ordered pairs for this equation.
(0, ), (2, ), ( , -1) x + y = 3

Click here to see answer by Alan3354(69443)

Question 1060738: Complete these ordered pairs for this equation.
(0, ), (2, ), ( , -1) x + y = 3

Click here to see answer by Alan3354(69443)

Question 1061006: Write in terms of a: S=n(a+L)/2
Click here to see answer by Boreal(15235)

Question 1061526: (x,y)=(рcos(θ)−ssin(θ),рsin(θ)+scos(θ))
Hey guys!I can't understand why x is equal to pcosθ−ssinθ and the same problem with y.
So could you explain me this in details if you know it?
There is a link to the problem https://i.stack.imgur.com/H1oe9.jpg
My teacher told me about Jacobian and transformation from catesian to polar system coordinates but no success.I also tried to solve it in polar coordinates and the same results/no success/
Click here to see answer by ikleyn(52775)

Question 1061857: What are the factors of 3y�-xy-4x�
Click here to see answer by stanbon(75887)

Question 1061924: An equation has the form a/x + x/b = c, where a, b and c are constant and b<>0. How many solutions can this equation have?
Click here to see answer by ikleyn(52775)

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, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760