Solve the following systems of linear equations using Gaussian elimination.
x + 2y + 2z = 7
6x + 11y + 9z = 35
x + y - 2z = -3
(5, ? 2, 3)
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Graph the pair of polar equations on a calculator, together on the same screen, and use the trace feature to estimate the polar coordinates of all points of intersection of the curves. Round to the nearest hundredth, if necessary.r = 6 cos ?, r = 1 + 4 cos ?
A. (3, 5.24), (3, 1.04) B. (3, 2.62), (3, 4.19) C. (3, 2.62), (3, 0.52) D. (-3, 5.24), (-3, 1.04)
Evaluate.140
A. 0 B. -1 C. 14 D. 1
Solve the inequality and graph the solution set.|z - 7| ? 0
A. [7, ?)
B. (-?, ?)
C. ?
D. [7, -7]
Solve the problem.The number of mosquitoes M(x), in millions, in a certain area depends on the June rainfall x, in inches, according to the equation 
What rainfall produces the maximum number of mosquitoes?
A. 10 in. B. 0 in. C. 20 in. D. 400 in.