Write the augmented matrix for the system of linear equations.
a. 
b. 
c. 
d. 
d.
Mathematics
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Replace the polar equation with an equivalent Cartesian equation.r = -12 csc ?
A. y = -12 B. x = -12 C. -12y = 1 D. -12x = 1
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Rewrite the expression in terms of exponentials and simplify the results. ln (cosh 9x - sinh 9x)
A. -9 B. ln (e9x - e-9x) C. -9x D. -18x
Mathematics
Solve the problem.A $74,000 trust is to be invested in bonds paying 8%, CDs paying 5%, and mortgages paying 9%. The bond and CD investment together must equal the mortgage investment. To earn a $5930 annual income from the investments, how much should the bank invest in bonds?
A. $12,000 B. $23,000 C. $25,000 D. $37,000
Mathematics
Add the polynomials.(9x + 5) + (5x - 9)
A. 10x2 B. 10x C. 14x2 - 4 D. 14x - 4
Mathematics