Solve the problem using Gaussian elimination.A $120,000 trust is to be invested in bonds paying 7%, CDs paying 6%, and mortgages paying 10%. The sum of the bond and CD investment must equal the mortgage investment. To earn an $9740 annual interest from the investments, how much should the bank invest in bonds?
A. $60,000
B. $46,000
C. $12,000
D. $14,000
Answer: D
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Solve the inequality.(x - 7)(x + 1) ? 0
A. x ? -1 or x ? 7 B. x > 7 C. 7 < x < -1 D. x ? -7 or x ? 1
Provide an appropriate response.For the matrix 
write the minor of the element in the second row, third column. (Do not evaluate.)
A.
det 
B.
det 
C.
det 
D.
det 
Solve the problem.A bike road race starts at an elevation of 620 feet and passes through 5 stages where the elevation changes by 309 feet, -378 feet, 270 feet, -105 feet, and 252 feet. At what elevation does the race end?
A. 836 ft B. -1934 ft C. 1934 ft D. 968 ft
Solve the equation. State whether the equation is a contradiction, an identity, or a conditional equation.19x + 7(x + 1) = 26(x + 1) - 19
A. all real numbers; identity B. ? or { }; contradiction C. {1}; conditional equation D. {0}; conditional equation