Solve. Round to two decimal places unless otherwise noted.Suppose a cost-benefit model is given by y = 
, where y is the cost in thousands of dollars for removing x percent of a given pollutant. Find the cost of removing 25% to the nearest dollar.
A. $2200
B. $2933
C. $333
D. $8800
Answer: B
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Use the Gauss-Jordan method to find A-1, if it exists.A = 
A. 
B. 
C. 
D. Does not exist
Find the center and the vertices located on the major axis of the ellipse: 
a. Center: (0, 0); vertices: (–9, 0), (9, 0) b. Center: (0, 0); vertices: (0, –9), (0, 9) c. Center: (–9, 9); vertices: (–1, 0), (1, 0) d. Center: (0, 0); vertices: (–9, –1), (9, 1)
Solve by any method. If there is not one solution to a system, state why.-6y + 7y = 3x + 3(x + 2) - 3x - 23(x + y) - x + y = 30
A. No solution, inconsistent system B. (1, 7) C. (7, 1) D. Infinite number of solutions, dependent system
Find the inverse function f-1 of the function f.f(x) = 7 sin x - 4
A. f-1(x) = sin-1
B. f-1(x) = sin-1
C. f-1(x) = cos 
D. f-1(x) = 7 sin-1 x - 4