Translate the problem to a system of equations, then solve using matrices.A $42,000 trust is to be invested in bonds paying 7%, CDs paying 5%, and mortgages paying 9%. The sum of the bond and CD investment must equal the mortgage investment. To earn an $3160 annual income from the investments, how much should the bank invest in bonds?
A. $10,000
B. $21,000
C. $11,000
D. $9,000
Answer: C
Mathematics
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Solve the system.2x + 2y + z = -85x - 2y - z = -274x + y + 3z = -24
A. {(-5, 2, -2)} B. {(-5, -2, 2)} C. ? D. {(-2, 2, -5)}
Mathematics
Solve the problem.Find the number of units that must be produced and sold in order to yield the maximum profit, given the following equations for revenue and cost:R(x) = 60x - 0.5x2C(x) = 7x + 3.
A. 54 units B. 67 units C. 53 units D. 56 units
Mathematics
Simplify the radical expression. Assume that all variables represent positive real numbers.
A. 
B. x6
C. 6x6
D. 
Mathematics
Solve the inequality and graph the solution set.4x - 4 ? 3x - 13
A. {x|x < 4} or (-?, 4)
B. {x|x ? -9} or (-?, -9]
C. {x|x > 4} or (4, ?)
D. {x|x ? -9} or [-9, ?)
Mathematics