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+0  
 
0
108
3
avatar+1364 

 

thank you for checking

 Oct 4, 2019
 #1
avatar+1364 
+1

if you could check this ne as well, wasnt sure what to put at the bottom, if you could help with that ?thank you again, this is the last three 

 Oct 4, 2019
 #2
avatar+104962 
+3

First one  

 

-9    is correct

 

 

Second one

 

-3R2 + 4R1  .....as before......I assume that the result goes in R1

 

-3R2   =  -24     3    -9

4R1  =    -12    20    8

              ___________

              -36   23    -1   

 

So.....the resulting matrix  is

 

-36   23   -1

   8     1    3

     

cool cool cool

 Oct 4, 2019
 #3
avatar+104962 
+3

The second one is easier if we identify what the parts of each martix represent

 

The first matrix

 

   S          M        L

[ 1.50    2.50    6.50   ]    prices of the three sizes at store 1

[ 2.00    3.50    8.00   ]    prices of the three sizes at store  2

 

The second matrix  

No. on shelf     No. in stockroom

 of each size     of each size

  10                    24              S

   18                   48              M

   6                     12              L

 

The first row of the first matrix x the first column of the second gives the total  price of the stock on the shelves in store 1....so  this is  entry a11  in the resulting matrix  = 

(1.50)(10 ) + (2.50)*(18)  + (6.50)(6)  =  99

 

The first row of th first matrix x the secolumn of the second matrix gives the total price of the stock in the stockroom at store 1....this   is entry a12  in the resulting matrix =

(1.50)(24 ) + (2.50)(48) + (6.50)(12)  = 234

 

The second row of the first matrix x the first column of the second matrix  gives  the total price of the stock on the shelves at store 2......this is entry a21  in the resulting matrix =

(2.00)(10) + (3.50)(18) + (8.00)(6)  = 131

 

Finally.....second row of the first matrix x second column of the second matrix gives the total price of the stock in the stockroom of store 2.....this is entry a22 in the resulting matrix  =

(2.00)(24) + (3.50)(48) + (8.00)(12)  = 312

 

So     we have the following resultant (product) matrix :

 

Shelves   Stockroom

99            234       Store 1

131          312       Store 2

 

The rows represent  the  different stores

And the columns represent the location of the stock within each store

 

 

cool cool cool

 Oct 4, 2019
edited by CPhill  Oct 4, 2019

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