Solve the system of equations by Gauss-Jordan elimination.
A. {(-3, 4, 1)}
B. {(-3, 1, 4)}
C. {(1, 4, -3)}
D. ?
Answer: D
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Use long division to divide the polynomials.(8x3 - 2x2 - 26x - 15) ÷ (4x + 3)
A. 2x2 - 5 B. 2x2 - 2x - 5 C. x2 - 2x - 5 D. x2 + 2x + 5
Find vectors b and c and matrix A so that the problem is set up as a canonical linear programming problem of the form: maximize cTx subject to Ax ? b and x ? 0. Do not find the solution.Minimize x1 - 2x2 + 3x3 subject to 4x1 - 6x3 ? 30 4x1 - x2 = 28and x1 ? 0, x2 ? 0, x3 ? 0
A. b = 
, c = 
, and A = 
B. b = 
, c = 
, and A = 
C. b = 
, c = 
, and A = 
D. b = 
, c = 
, and A = 
Solve the problem.Economists use what is called a Leffer curve to predict the government revenue for tax rates from 0% to 100%. Economists agree that the end points of the curve generate 0 revenue, but disagree on the tax rate that produces the maximum revenue. Suppose an economist produces this rational function 
where R is revenue in millions at a tax rate of x percent. Use a graphing calculator to graph the function. What tax rate produces the maximum revenue? What is the maximum revenue?
A. 37.5%; $210 million B. 35.8%; $209 million C. 34.9%; $207 million D. 39.6%; $209 million
Find the sum.
- 
+ 
- . . .
A. 
B. 
C. - 
D. Does not exist