## mbloodworth 2 years ago 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?

1. mbloodworth

2. RaphaelFilgueiras

linear combination of columns cr*C1+cp*C2

3. mbloodworth

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?

4. RaphaelFilgueiras

that is not determinant

5. RaphaelFilgueiras

|dw:1372136163766:dw|

6. mbloodworth

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

7. mbloodworth

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

8. RaphaelFilgueiras

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

9. mbloodworth

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

10. RaphaelFilgueiras

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11. RaphaelFilgueiras

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12. RaphaelFilgueiras

13. mbloodworth

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?

14. mbloodworth

Sorry, 20

15. RaphaelFilgueiras

yes

16. mbloodworth

Awesome. Thanks so much!!

17. RaphaelFilgueiras

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

18. mbloodworth

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

19. RaphaelFilgueiras

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20. RaphaelFilgueiras

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21. mbloodworth

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

22. RaphaelFilgueiras

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23. mbloodworth

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

24. RaphaelFilgueiras

lol, let me see

25. mbloodworth

you're awesome lol

26. RaphaelFilgueiras

~0.08

27. mbloodworth

thanks a billion

28. RaphaelFilgueiras

yw

29. mbloodworth

i wish i could pay you to help me lol

30. RaphaelFilgueiras

i wish it too lol