Provide an appropriate response.Suppose that you are solving a system of three linear equations and three variables by the Gaussian elimination method and you obtain the augmented matrix. 
What row operation would you perform next?
A. Add -15 times row 1 to -12 times row 3 to obtain a zero in the third row, second column position.
B. Multiply row 1 by - 
.
C. Multiply row 2 by - 
.
D. Add row 1 to row 2.
Answer: C
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = -3x + 8y
A. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
c > 0
C. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: lines 
c ? 0
D. Domain: all points in the xy-plane; range: real numbers z ? 0 ; level curves: lines 
c ? 0
Solve the right triangle shown in the figure. Round lengths to one decimal place and express angles to the nearest tenth of a degree. 
A = 36°, b = 51.2
A. B = 36°, a = 70.5, c = 41.4 B. B = 54°, a = 37.2, c = 63.3 C. B = 36°, a = 41.4, c = 37.2 D. B = 54°, a = 70.5, c = 87.1
Determine whether the given relationship defines a function. If so, identify the independent and dependent variable, and why the relationship is a function.The salary s of an employee on her hiring date d.
A. No B. Yes; d, s; there is one salary s on the hiring date d.
Factor the polynomial completely.128x2 - 200y2
A. 8(4x + 5y)(4x - 5y) B. Does not factor C. (32x + 40y)(4x - 5y) D. (4x + 5y)(32x - 40y)