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

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 Question 294674: i need help solving this equation its 4.00x+6.00y=2340, x+y=480 Click here to see answer by richwmiller(10282)

 Question 295104: What is the remainder? A. -2 B. -1 C. 0 D. 1 E. 2 Click here to see answer by richwmiller(10282)

 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(10282)

 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(10282)

 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(10282)

 Question 297745: Construct a truth table for (~p q) p Click here to see answer by user_dude2008(1861)

 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(10282)

 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(1861)

 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(1861)

 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(13127)

 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(29613)

 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(13127)

 Question 300356: What is the solution to the inequality shown in the problem? -1 + b>_ 9 Click here to see answer by Fombitz(13828)

 Question 301368: f(x) = |x| and g(x) = x - 1. How many solutions x satisfy f(x) = g(x)? Click here to see answer by Fombitz(13828)

 Question 301470: Given two points on the line, input the equation of the line in standard form Ax + By = C. Reduce all fractional answers to lowest terms. (6, 1), (5, 4) Click here to see answer by Alan3354(34678)

 Question 301469: Given two points on the line, input the equation of the line in standard form Ax + By = C. Reduce all fractional answers to lowest terms. (7, -3), (4, -8) Click here to see answer by Alan3354(34678)

 Question 302482: A cruise boat travels 48 miles downriver in 4 hours and returns to its starting point upriver in 12 hours. Find the speed of the river. Click here to see answer by Alan3354(34678)

 Question 303178: use synthetic division to divide x^4+4x^3+6x^2+4x+1 by x+1 Click here to see answer by CharlesG2(828)

 Question 303311: write the interval notation for the set {x|-3>x>5} Click here to see answer by Fombitz(13828)

 Question 305981: solve the following formula for the indicated variable A=1/2 (B+b)h solve B Click here to see answer by texttutoring(324)

 Question 305989: solve the linear inequality 3z-1 > (or equal to) 3+5z Click here to see answer by checkley77(12569)

 Question 307041: The half-life of C-12 is about 3,700 years. How long will it be before a 2.35g sample of C-12 decays to 1.46g of C-12? I have no clue...please help. Thank You Click here to see answer by scott8148(6628)

 Question 307444: what can be said of points with equal abscissa? with equal ordinates? Click here to see answer by rapaljer(4670)

 Question 307453: what do points on the parallel to x-axis 5 units above it have in common? Click here to see answer by rapaljer(4670)

 Question 307615: A cable car is carrying passengers down a hill at a downgrade of 12%. if the passengers descend 1,250 feet, through what horizontal distanve have they travelled? Click here to see answer by ankor@dixie-net.com(16525)

 Question 307760: with a fixed cost of \$4000, 20 items cost a total of \$10,000, find a linear cost function Click here to see answer by rapaljer(4670)