Part of $6,000 is invested at 9%, another part at 11%, and the remainder at 12% yearly interest. The total yearly income from the three investments is $650. The sum of the amounts invested at 9% and 11% equals the amount invested at 12%. How much is invested at each rate?
A. $2,000 at 9%, $1,000 at 11%, and $3,000 at 12%
B. $1,500 at 9%, $0 at 11%, and $3,500 at 12%
C. $3,000 at 9%, $0 at 11%, and $3,000 at 12%
D. $1,500 at 9%, $1,000 at 11%, and $3,500 at 12%
E. $2,500 at 9%, $2,000 at 11%, and $2,000 at 12%
Answer: A
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x2 + 
x + 
= 0
A. - 
B. 
C. 
D. 
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What will be an ideal response?