By multiplying matrices, calculate the matrix for total dollar volume of sales.
I know how to multiply matrices, but this question makes absolutely no sense. What do I multiply?

- anonymous

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- anonymous

##### 1 Attachment

- anonymous

linear combination of columns cr*C1+cp*C2

- anonymous

But if you did that, how would the determinant be found? That makes no sense how that can be found if it is in the rows and columns like that. So in thousands, would the first be 10000,000?

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- anonymous

that is not determinant

- anonymous

|dw:1372136163766:dw|

- anonymous

Im sorry, I have been working on a ton of stuff. It's past midnight my time. How can you find that?

- anonymous

Math is not my forte. As I am sure you can tell, haha.

- anonymous

the result is only the sum of cr*first column and cp*second column

- anonymous

Right, so what would that be? In thousands? Because that is what it is listed as in the problem copied

- anonymous

|dw:1372136309101:dw|

- anonymous

|dw:1372136488612:dw|

- anonymous

now just add them

- anonymous

okay. so what I am going to do (just to make sure I understand the drawings)
1. 500*200, 500*15, 500*5
2. 600*30, 600*5, 600*2
Then add the results of 500*2 and 600*30 together, and so on?
Is that correct?

- anonymous

Sorry, 20

- anonymous

yes

- anonymous

Awesome. Thanks so much!!

- anonymous

multiplication by left is linear combination of columns, and by right is linear combination of rows

- anonymous

I'm sorry I don't quite understand that. Can you put in smaller terms? Like I said, math is not my forte.

- anonymous

|dw:1372136788063:dw|

- anonymous

|dw:1372137032274:dw|

- anonymous

okay question, on logarithms... 7^(3x - 1) = 5^(x - 1) what is x?

- anonymous

|dw:1372138198267:dw|

- anonymous

so would that be 12.33, -3.09, or .08?

- anonymous

lol, let me see

- anonymous

you're awesome lol

- anonymous

~0.08

- anonymous

thanks a billion

- anonymous

yw

- anonymous

i wish i could pay you to help me lol

- anonymous

i wish it too lol

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