1,975 Answered Questions for the topic linear algebra

Linear Algebra

07/27/20

Rob weighs 6 kg more than Kiara.Kiara can lift 6 kg less than one and a half times her weight.Rob can lift a quarter more than his weight.They can both lift the same weight.How much does Rob weigh?
Kiara is changed into KRob is equal to R
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Linear Algebra

07/24/20

How do you create a system of equations that has (-2, 5) as it’s only solution?
Your system must have this form: Ax + By = C and Dx + Ey = F. None of A, B, D, or E is equal to 0 or 1. It’s okay if C or F end up being equal to 0 or 1.
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Linear Algebra Algebra 1 Algebra 2 Prealgebra

07/21/20

Graph exponential function
Hi peeps, can somebody please help me with this exercise? I'm having a hard time with it and am going nowhere.Thank you in advance!!Graph the function  and its reflection about the line y=x on the... more
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Linear Algebra Math Algebra Linear Equations

07/20/20

Algebraic word problem
Given that y = ax + b/8. When y = 1, x = 13 and when y = -1, x = -3. What is the value of b?
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Linear Algebra Math Algebra Linear Equations

07/20/20

Boat rate of change problem
A boat travels with the current at 21 km/hr and travels against the current at 13 km/hr. The speed of the boat in still water is v km/hr. What is the value of v?
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Linear Algebra Math Algebra Linear Equations

07/20/20

Fraction word problem
Alex's age now is 6/7 that of Kate's. Eight years ago, Alex's age was 2/7 as much as Kate's present age. Kate is now k years old. What is the value of k?
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Linear Algebra Math Algebra Linear Equations

07/20/20

Fraction word problem
A fraction is equivalent to 6/7. It's denominator is 5 more than its numerator. What is the denominator of this fraction?
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Linear Algebra Math Algebra Linear Equations

07/20/20

Airplane rate of change problem
Flying against the wind, a plane travels 2,400 km in 6 hours. Flying with the wind, the plane travels the same distance in 4 hours. In the absence of wind, the speed of the plane is k kilometers... more
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Linear Algebra Math Algebra Linear Equations

07/20/20

Algebraic word problem
The sum of the digits of a 2-digit number is 7. If the digits are reversed the new number is 32 more than 10 times the tens' digit of the original number. What is the original number?
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Linear Algebra Math Algebra Linear Equations

07/20/20

Age difference word problem
Julia's age now is half that of Nicola's. One year from now, Julia's age will be three-fourth of Nicola's present age. Nicola is now n years old. What is the value of n?
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Linear Algebra Math Algebra Linear Equations

07/20/20

Airplane rate of change problem

Flying against the wind, a plane travels 2,000 km in 5 hours. Flying with the wind, the plane travels the same distance in 4 hours. The speed of the wind is s kilometers per hour. What is the value... more
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Linear Algebra Linear Equations Finite Math

07/19/20

Solving Systems of Equation with row operations
3x - y + 5z = 14 2x + 3y + 4z = 7 x + y + z = 2
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Linear Algebra Linear Equations Finite Math

07/19/20

Solving Systems of equations with row operations
2x - y - 5z = 11 x + 3y + 2z = 14 3x + 8y + 7z = 35
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Linear Algebra

07/18/20

Given A has the same row space as rref A, do they both have the same basis in general
In Strang’s book in the section on the Dimensions of the Four Subspaces, he says, “ A has the same row space as R. Same dimension r and same basis.“i believe they have the same dimension and same... more
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Linear Algebra

07/17/20

Customers at a supermarket have been increasing at...
Customers at a supermarket have been increasing at a linear rate. In 2011 the number was 570,000. In 2012 was 730,000 if y represent the number of customers visiting the supermarket per year and x... more
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Linear Algebra Algebra 1 Algebra 2 Prealgebra

07/12/20

Inverse Functions in Algebra
Hey, would anyone help me with this inverse function exercise? I have no idea what to do. Suppose  is a function from the set of real numbers to the same set with . We write  to represent  and . Is... more
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Linear Algebra Math Algebra Linear Equations

07/10/20

PLS HELP :)) i am not sure how to solve this problem
The cost of making 11 tables is $1,140. The cost of making 25 tables is $1,560. Assume this is a linear relationship.What is the cost per table? Write a linear equation that tells you the total... more
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Linear Algebra

07/10/20

What is the meaning of subspace and how are they used in linear algebra?
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Linear Algebra Math Algebra 1 Algebra 2

07/09/20

Any composition and inversion expert out there?
I need help to finish the following exercise (I was able to finish 2 by myself but not the other ones. A step by step explanation would be highly appreciated!):1. What can be said about the domain... more
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Linear Algebra Algebra 1

07/09/20

Solve application problems using linear systems.
Last year, Singer A performed four more than three times as many shows during concert tours than Singer B. The number of Singer A concert tour shows exceeded the number of shows by Singer B by 38.... more
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Linear Algebra Algebra 1

07/09/20

Solve application problems using linear equations.
A rectangular room is 1.7 times as long as it is wide, and its perimeter is 28 meters. Find the dimensions of the room.
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Linear Algebra Algebra 1

07/09/20

Solve application problems using linear equations.
Suppose that you are taking a course that has 4 tests. The first three tests are for 100 points each and the fourth test is for 200 points. To get a B in the course, you must have an average of at... more
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Linear Algebra Algebra 1

07/09/20

Solve application problems using linear equations.
Randall is 8 years older than Ashley. In 3 years the sum of their ages will be 78. How old is Randall now?
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Linear Algebra Algebra 2 Algebra

07/08/20

How to solve this question for college algebra.
The cost C of producing x thousand calculators is given by the equation below. C = -1 4.4x^2 + 14,390x + 580,000 (x <150) The average cost per calculator is the total cost C divided by the... more
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Linear Algebra Algebra Equations

07/07/20

I don't understand
A bank loaned out $18,500, part of it at the rate of 9% annual interest, and the rest at 6% annual interest. The total interest earned for both loans was $1,335.00. How much was loaned at each... more
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