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

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 Algebra: Linear Algebra (NOT Linear Equations) Solvers Lessons Answers archive Quiz In Depth

 Question 414935: In a golden rectangle the ratio of the length to the width equals the ratio of the length plus width to the length. find the value of this golden ratio (Do not approximate the answer) Click here to see answer by rfer(12644)

 Question 415972: y=x+4 y=3x How do you solve the system of equations? Click here to see answer by praseenakos@yahoo.com(507)

 Question 416178: v=1/3 * π*r^(2)*h making h the subject We have this to solve making h the subject: cross multiply So we obtain (we divide by ) Click here to see answer by dnanos(83)

 Question 417783: Solve the sytem of equations by elimination. 3x + 5y = 29 3x + 2y = 44 Click here to see answer by MathLover1(6613)

 Question 417999: Solve the system of equations using the elimination method: x + y = 9 1x + 3y = 15 Click here to see answer by mananth(12270)

 Question 417998: Solve the system of equations using the elimination method: .08x + .06y = 144 x + y = 2000 Click here to see answer by mananth(12270)

 Question 417997: Solve the system of equations using the elimination method: 3x + 5y = 2995 x + y = 729 Click here to see answer by mananth(12270)

 Question 417996: Solve the system of equations using the elimination method: 5x + y = 14.94 3x + 2y = 22.95 Click here to see answer by mananth(12270)

 Question 417994: Solve the system of equations using the elimination method: 2x + 4y = 205 3x + 8y = 342.50 Click here to see answer by Edwin McCravy(8879)

 Question 422004: Find the equation of the line that is parallel to 4x-2y=4 and pases through the point (-2,3). Click here to see answer by stanbon(57219)

 Question 423406: Maple syrup worth \$6.00 a gallon and corn syrup worth .80 cents a gallon are used to make a mixture worth \$2.36 a gallon. How many gallons of each kind of syrup are need to make 50 gallons of the mixture? Click here to see answer by josmiceli(9647)

 Question 423579: I am confuse some could someone help please. Explain the domain and range of a function. Under what circumstances would the domain be something other than "all real numbers"? Provide an example of a function whose domain does not include all real numbers. Click here to see answer by scott8148(6628)

 Question 423777: Which of the following equations describes a line that is parallel to 3y = x + 3? A)x-6y=15 B)4y=x+5 C)2x-6y=7 D)2x+4y=9 Click here to see answer by mananth(12270)

 Question 424002: Multiply (2x+6)(5x^2+2x+5) Factor completely 180b^2+ 300bd +125d^2 Factor completely 9x^8 - 45x^7 + 63x^6 Add (5r^4-2r^3+2r^2+12r-7)+(r^5+8r^3+7r^2-2r+5)+(8r^4+r^2-8r-7) Click here to see answer by linht117(37)

 Question 424712: find the slope of the line containing the given pair of points. if the line is undefined, state so. (5,3) and (8,-4) Click here to see answer by stanbon(57219)

 Question 424713: solve the problem Kannanaski Rapids drops 72 feet vertically over a horizantal distance of 824 feet. what is the slope of the rapids? round your answer to two decimal places Click here to see answer by stanbon(57219)

 Question 425274: parallel to the graph of 2x-y=1;y- intercept (0,-3) Click here to see answer by stanbon(57219)

 Question 426928: Find the slope and y intercept of g(x) = -5x+7 Click here to see answer by richard1234(5390)

 Question 426930: show the steps on how to find the slope and y intercept of g(x) = -5x+7 Click here to see answer by richard1234(5390)

 Question 426888: Factor f(x) into linear factors given that k is a zero of f(x) f(x)=x^3-3x^2-36x+108; k=6 Click here to see answer by edjones(7569)

 Question 427263: How many solutions does the following system of equations have? y = -3x + 8 y = -3x + 9 Click here to see answer by robertb(4012)

 Question 428756: y=-5x²+3 Looking for how to solve non linear equation. thank you... Click here to see answer by stanbon(57219)

 Question 429017: solve eah system of equation. If the system has no solution, say that it is inconsistent. x-y=5 -3x+3y=2 Click here to see answer by IWork4Dessert(60)

 Question 429449: If A and B are (nxn) matrices such that A is non singular and AB = 0 , then prove that B = 0 . Click here to see answer by robertb(4012)

 Question 429582: Use Linear Combinations to solve the Linear System 2-7x=9y 2y-4x=6 I dont get how you use linear combinations to solve this. My book doesn't explain things into detail and my teacher doesn't either. Thanks! Click here to see answer by Alan3354(30958)

 Question 429673: a ski boat that cost \$27,600 when new will have no salvage value after 12 years. Find its annual rate of depreciation Click here to see answer by ewatrrr(10682)

 Question 430834: I'm trying to help my niece with an algebra problem that has both of us stumped... (s+t)(s-t)(s+t)(s-t) The answer provided in her book is: s^4-2t^2s^2t^2 I can't even get close to this answer. I got the s^4 and think I got the s^2 and t^2, but I can't figure out the -2t^2. If you can tell me what I'm doing wrong, I'd appreciate it. I came up with: (s)(s)(s)(s) = s^4 (t)(-t)(t)(-t) = t^2 I am so confused right now, I don't know what to do. It's been years since I had Algebra. Click here to see answer by shree840(260)
 Question 430834: I'm trying to help my niece with an algebra problem that has both of us stumped... (s+t)(s-t)(s+t)(s-t) The answer provided in her book is: s^4-2t^2s^2t^2 I can't even get close to this answer. I got the s^4 and think I got the s^2 and t^2, but I can't figure out the -2t^2. If you can tell me what I'm doing wrong, I'd appreciate it. I came up with: (s)(s)(s)(s) = s^4 (t)(-t)(t)(-t) = t^2 I am so confused right now, I don't know what to do. It's been years since I had Algebra. Click here to see answer by mananth(12270)
 Question 430834: I'm trying to help my niece with an algebra problem that has both of us stumped... (s+t)(s-t)(s+t)(s-t) The answer provided in her book is: s^4-2t^2s^2t^2 I can't even get close to this answer. I got the s^4 and think I got the s^2 and t^2, but I can't figure out the -2t^2. If you can tell me what I'm doing wrong, I'd appreciate it. I came up with: (s)(s)(s)(s) = s^4 (t)(-t)(t)(-t) = t^2 I am so confused right now, I don't know what to do. It's been years since I had Algebra. Click here to see answer by Alan3354(30958)

 Question 431005: the graph of f(x) resembles the graph of g(x)=x^2, but has been flipped over the x-axiz and shifted down 4 units and left 1 unit. write the the equation of f(x). Click here to see answer by ewatrrr(10682)

 Question 431438: Please give an equation of a nonlinear function and provide two inputs. Example: x2+y2=1 Click here to see answer by Alan3354(30958)

 Question 431841: The stretch in a wire under a given tension varies directly as the length of the wire and inversely as the square of its diameter. If the length and the diameter of a wire are both doubled, what is the effect on the stretch of the wire? Please and thank you!! :) Click here to see answer by mananth(12270)

 Question 432426: Mary has two tanks of fish. If she transfers 15 fish from the larger tank to the smaller tank, then the number of fish in the smaller tank will be 5/7 of fish in the larger tank. Given that there are 35 fish in the smaller tank originally, find the number of fish in the larger tanik before the transfer of fish. Click here to see answer by belle3833(46)

 Question 432428: As part of the 'learning journey'program, 73 pupils travelled on two buses, one air-conditioned and one non-air-conditioned, to the Singapore Discovery Centre. Three-fifths of the pupils on the air-conditoned bus were girls. There were 17 boys in the non-air conditioned bus. The number of girls on the two buses were equal. How many pupils were there on the air-conditioned bus? Click here to see answer by htmentor(788)

 Question 436290: I think I picked the right area for this [?]. I am at a loss to set this one up in formulas. I get the rate/minute idea but get lost setting up an equation to get the answer. Thank you. A fire engine starts pumping water at 9:20 am at the rate of 800 gallons per minute. Another fire engine, pumping at the rate of 1,000 gallons per minute, starts at 9:30 am. At what time will the 2 engines have pumped the same number of gallons? Click here to see answer by ankor@dixie-net.com(15623)