# 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 149071: solve this equations. Write the solution as an ordered triple 5x + 3y + z =23 x - 3y + 2z =10 14x - 2y + 2z =85 Click here to see answer by Edwin McCravy(8999)

 Question 150416: Use the equation of the regression line to predict y when x =20 x 5 8 6 10 12 9 ------------------------- y 18 20 15 25 30 25 Please help, Ellen Click here to see answer by Fombitz(13828)

 Question 150490: Can anyone help me find the area under the normal distribution curve to the right of z= -3.24 Ellen Click here to see answer by Edwin McCravy(8999)

 Question 150725: I am not sure how to categorize my question. My nephew and I would like to find the right formula to calculate the following: A rectangle Side A is x + 20 Side B is x Area = 576 We know that x = 16 but we do not know a formula that gives us this answer (16). Any help would be greatly appreciated Paul Click here to see answer by nerdybill(7003)

 Question 150744: what is the equation in the standard form of the line through (4,1) and (-2,3)? Click here to see answer by Electrified_Levi(103)

 Question 150770: Adult tickets for a play cost \$25 each and children's tickets cost \$15 each. The total receipts were \$7200 and the total attendance was 400. How many adults and how many children attended Click here to see answer by stanbon(57940)

 Question 150773: the domain of the function F: x->x^3-5 is D={0,1,2,3,4}. Find the range of f. Click here to see answer by vleith(2825)

 Question 150768: find the equation of the line with x-intercept 5 and y-intercept 8. Click here to see answer by Fombitz(13828)

 Question 151459: 1. Solve for X and Y in the following problems. Make sure you show all your work so you can get partial credit even if your final answer is wrong. a. X + Y=7 , X + 2Y = 11 b. 3X + 7Y = 24, 9X + 5Y = 24 c. 4X + Y = 17, 2X + 3Y = 21 d. 18X + Y = 42, 6X - 3Y = -6 Click here to see answer by checkley77(12569)

 Question 151720: a principal walks in and said I am 4 times the age of my grandson and my son is 11 years younger than my daughter and my daughter is 30 years older than my grandson .. all of our ages equal 196..how old is the principal???? Click here to see answer by ankor@dixie-net.com(15745)

 Question 152126: 1. The average of three consecutive even numbers is more than 100. Find the smallest set of numbers. --write an expression representing the sum of three consecutive even numbers. --write the expression representing the average of the three consecutive even numbers. --write the inequality to solve the problem. --solve the problem and answer the question. 2.The sides of an equilateral is increased by 5,10, and 15. if the perimeter of the new triangle is more than twice the original triangle, what could be the length of the equilateral triangle? --draw a digram of the two triangles. --write an expression for the perimeter of the equilateral triangle. --write an expression for the perimeter of the new triangle. --write the inequality to solve the problem. --solve the inequality and answer the question. 3.Joey is building a larger kennel for his dog. His dog's kennel is currently 4'x6'. he increases the length and width by the same amount. if the perimeter of the new kennel is at most twice the perimeter of the original kennel, how much could he increase the length and width of the old kennel? --draw a diagram of the problem: --write an expression representing the perimeter fo the new kennel: --write the inequality to solve the problem: --solve the problem and answer the question. Click here to see answer by ankor@dixie-net.com(15745)

 Question 152346: How do you find the slope with only one point to work with? The first point is (3,4). The problem I am trying to solve is: Consider the semicircle of radius 5 centered at (0,0) as shown in the figure. Find an equation of the line tangent to the semicircle at the point (3,4). (hint: A line tangent to a circle is perpendicular to the radius at the point of tangency.) Click here to see answer by Earlsdon(6294)

 Question 152706: Please assist me inorder for me to understand linear equations and their solutions; Solve: A function gives the value of C as 2x (22/7) x r. Find C when r=21 cm and r = 84 cm. Thank you. Click here to see answer by jojo14344(1512)

 Question 153181: How do you solve for x: a(x-3)+8 = b(x-1) Click here to see answer by jojo14344(1512)

 Question 153216: two lines are parallel if and only if their slopes are _____________. Click here to see answer by jim_thompson5910(28696)
 Question 153216: two lines are parallel if and only if their slopes are _____________. Click here to see answer by mangopeeler07(462)

 Question 153230: Solve equations for x: 15x5 -20x4 =6x3 -8x2 Determine the derivative of the following functions using positve exponents whenever necessary: f(x) = In(3x4 + 4x3 + 6x2) f(x) = e2x tan x Click here to see answer by Edwin McCravy(8999)

 Question 153419: Here is problem. I know the answer but now the operation.. Music Class has 1 freshman, 6 sophmores and 11 juniors. 1/3rd of the class are seniors. I instantly just shouted 9 but I don't know how I came up to it and need to know what the process is.. Click here to see answer by stanbon(57940)

 Question 153842: i want to start by saying thanks for helping me....but i'm juz solving a regular equation and it's -2x-7=9....and the answer is -8 but i thought it should be -1. because when i subtract the -7 from 9 it makes 2...but obviously the book added the 7 and 9....but there not both positive. So, can you please explain that to me? thanks Click here to see answer by nerdybill(7003)
 Question 153842: i want to start by saying thanks for helping me....but i'm juz solving a regular equation and it's -2x-7=9....and the answer is -8 but i thought it should be -1. because when i subtract the -7 from 9 it makes 2...but obviously the book added the 7 and 9....but there not both positive. So, can you please explain that to me? thanks Click here to see answer by hitchick247(3)

 Question 153821: State the slope and y-intercept of the graph of each equation. The equation is y=3/4x. Click here to see answer by orca(409)

 Question 154127: Thought I submitted this but not sure so trying again... Chemical Products makes two insect repellents, Regular and Super. The chemical used for Regular is 15% DEET, and the chemical used for Super is 25% DEET. Each carton of repellent contains 24 ounces of the chemical. In order to justify starting production, the company must produce at least 12,000 cartons of insect repellent, and it must produce at least twice as many cartons of Regular as of Super. Labor costs are \$8 per carton for regular and \$6 per carton for Super. How many cartons of each repellent should be produced to minimize labor costs if 59,400 ounces of DEET are available? I just need help setting up the problem, I think I can get the rest.. Click here to see answer by stanbon(57940)

 Question 154110: Chemical Products makes two insect repellents, Regular and Super. The chemical used for Regular is 15% DEET, and the chemical used for Super is 25% DEET. Each carton of repellent contains 24 ounces of the chemical. In order to justify starting production, the company must produce at least twice as many cartons of Regular as ofSuper. Labor costs are \$8 per carton for Regular and \$6 per carton for Super. How many cartons of each repellent should be produced to minimize labor costs if 59,400 ounces of DEET are available? I only need help setting up the problem, the rest I can get... THANKS! Click here to see answer by josmiceli(9817)

 Question 154241: I need help trying to find out how to: write an equation in slope intercept form for the line that contains the given point and is perpendicular to the given line. (2,5) , 6x+2y=24 Click here to see answer by Alan3354(31487)

 Question 154283: How do you begin to solve -4x+2y=10 over 6x+2y=10 Click here to see answer by jim_thompson5910(28696)
 Question 154283: How do you begin to solve -4x+2y=10 over 6x+2y=10 Click here to see answer by stanbon(57940)

 Question 154282: A triangular sail has the area of x^2 + 5x + 6 square meters and a height of x + 3 meters. Find the length of the sail's base. Click here to see answer by jim_thompson5910(28696)
 Question 154282: A triangular sail has the area of x^2 + 5x + 6 square meters and a height of x + 3 meters. Find the length of the sail's base. Click here to see answer by stanbon(57940)

 Question 154349: For f(x) = 8x – 9, find f(-3). Click here to see answer by Alan3354(31487)

 Question 154481: Multiply: (x – 4)(2x2 – 7x + 8) Click here to see answer by checkley77(12569)