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September 19, 2014

September 19, 2014

Posted by **Kevin** on Tuesday, September 23, 2008 at 5:51pm.

- Mathematics -
**Reiny**, Tuesday, September 23, 2008 at 7:05pmwhy use a matrix for such a simple question?

let the amount invested at corporate bonds be $x

then the amount invested in treasurey bonds is $2x

then the amount invested in treasure bills is 10000-x-2x

then .06(10000-3x) + .07(2x) + .08x = 680

solve for x

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