Question 1

Solve the matrix equation: x  
+ 2  
+ y  
=

Accepted Answer

The answer of Solve the matrix equation: x  
+...

Question 2

If A =  
and B =  
,find A + B.

Accepted Answer

The answer of If A =  
and B =...

Question 3

If A =  
,determine (a)  
,and (b)the order of A.

Accepted Answer

The answer of If A =  
,determine (a) ...

Question 4

If 4  + 2 
= 
,then

Accepted Answer

A)  x = 0 and y = 0. 
B)  x = 4 and y = -5. 
C)  x = 0 and y = 4. 
D)  x =  and y =  
E)  There are no values for x and y which satisfy the equation.

Question 5

By only looking at the following equations,can you say if the equations have a unique solution or infinitely many solutions?

Accepted Answer

The answer of By only looking at the following equations,can...

Question 6

An appliance store has 25 refrigerators,30 ranges,and 10 dishwashers in stock.If the value of each refrigerator is $600,each range is $300 and each dishwasher is $250,use matrix operations to find the total value of the appliance store's inventory.

Accepted Answer

The answer of An appliance store has 25 refrigerators,30 ranges,and...

Question 7

Perform the indicated operations and simplify your answer: 2

Accepted Answer

The answer of Perform the indicated operations and simplify your...

Question 8

If B =  
and C =  
,find BC.

Accepted Answer

The answer of If B =  
and C =...

Question 9

A client wants 27 blocks of high-risk stock,27 blocks of moderate-risk stock,and 41 blocks of low-risk stock.Use the matrix operations on a graphing calculator to find how many of each portfolio should be suggested.

Accepted Answer

The answer of A client wants 27 blocks of high-risk...

Question 10

Find the income earned by the coal industry and its cost for the other forms of energy it uses.Then calculate its profit.

Accepted Answer

The answer of Find the income earned by the coal...

Question 11

Write A =  
if A is 2 × 2 and  
= 2i + j.

Accepted Answer

The answer of Write A =  
if A is...

Question 12

If the orders of the matrices Q,R,and S are 4 × 5,3 × 2,and 5 × 3,respectively,then the order of QRS is

Accepted Answer

A)  4 × 5. 
B)  3 × 5. 
C)  3 × 3. 
D)  2 × 4. 
E)  none of the above

Question 13

A pharmaceutical company manufactures 3 drugs for high blood pressure,A,B,and C,each of which requires a 2-step production process.The production cost of each drug has a materials and labor component.If the matrices  
and  
represent the costs per ounce associated with each step,use the matrix operations on a graphing calculator to write a matrix that shows the total cost of the two steps.  
  
=  
;  
=

Accepted Answer

The answer of A pharmaceutical company manufactures 3 drugs for...

Question 14

A manufacturer who produces one product is only interested in tracking material costs.What is the order of the matrix he would use?

Accepted Answer

The answer of A manufacturer who produces one product is...

Question 15

If R =  ,then 
=

Accepted Answer

A)   
B)   
C)   
D)   
E)  none of the above

Question 16

For one animal,she determines that she needs to combine these bags to get 6000 g of  ,12,000 g of 
,and 11,000 g of 
)How many bags of each type of food should she order?

Accepted Answer

The answer of For one animal,she determines that she needs...

Question 17

Determine whether the intersection of the planes:  
has a unique solution or infinitely many solutions; then solve the system.

Accepted Answer

The answer of Determine whether the intersection of the planes:...

Question 18

Consider the matrix  ,this matrix can be best described as a(n):

Accepted Answer

A)  upper triangular matrix 
B)  lower triangular matrix 
C)  diagonal matrix 
D)  main diagonal

Question 19

An office furniture company manufactures desks and tables at two plants,A and B.Matrix J represents the production of the two plants in January,and matrix F represents the production of the two plants in February.Use the matrix operations on a graphing calculator to write a matrix that represents the total product at the two plants for the two months.  
J =  
; F =

Accepted Answer

The answer of An office furniture company manufactures desks and...

Question 20

Use the matrix operations on a graphing calculator to show that A + (B +
B) + C.
C) = (A +

Accepted Answer

The answer of Use the matrix operations on a graphing...

Exam 7: Matrix Algebra

Solve the matrix equation: x + 2 + y =

If A = and B = ,find A + B.

If A = ,determine (a) ,and (b)the order of A.

If 4 + 2 = ,then

By only looking at the following equations,can you say if the equations have a unique solution or infinitely many solutions?

An appliance store has 25 refrigerators,30 ranges,and 10 dishwashers in stock.If the value of each refrigerator is $600,each range is $300 and each dishwasher is $250,use matrix operations to find the total value of the appliance store's inventory.

Perform the indicated operations and simplify your answer: 2

If B = and C = ,find BC.

A client wants 27 blocks of high-risk stock,27 blocks of moderate-risk stock,and 41 blocks of low-risk stock.Use the matrix operations on a graphing calculator to find how many of each portfolio should be suggested.

Find the income earned by the coal industry and its cost for the other forms of energy it uses.Then calculate its profit.

Write A = if A is 2 × 2 and = 2i + j.

If the orders of the matrices Q,R,and S are 4 × 5,3 × 2,and 5 × 3,respectively,then the order of QRS is

A manufacturer who produces one product is only interested in tracking material costs.What is the order of the matrix he would use?

If R = ,then =

For one animal,she determines that she needs to combine these bags to get 6000 g of ,12,000 g of ,and 11,000 g of )How many bags of each type of food should she order?

Determine whether the intersection of the planes: has a unique solution or infinitely many solutions; then solve the system.

Consider the matrix ,this matrix can be best described as a(n) :

Use the matrix operations on a graphing calculator to show that A + (B + B) + C. C) = (A +