<PRE><B>Question 217100</B>
D is -40
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For Dx:
|9 -1 3|
|5 +4 4|
|5 +2 2|

= 9(8-8) + 1(10-20) + 3(10-20)
= -10 -30
= -40
x = +1
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For Dy:
|2 9 3|
|1 5 4|
|3 5 2|

= 2(10-20) - 9(2-12) + 3(5-15)
= -20 +90 -30 = +40
y = -1
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For Dz:
|2 -1 9|
|1 +4 5|
|3  2 5|

= 2(20-10) + 1(5-15) + 9(2-12)
= 20 - 10 -90
= -80
z = 2</PRE>