Evaluate the determinant.
A. a2 - b2
B. a2 + b2
C. 2ab
D. 0
Answer: A
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Find parametric equations for the line described below.The line through the point P(3, -1, -3) and perpendicular to the plane 
A. x = -7t + 3, y = -2t - 1, z = -3 B. x = -2t - 3, y = 7t + 1, z = 5t + 3 C. x = -2t + 3, y = 7t - 1, z = 5t - 3 D. x = 2t - 3, y = -7t + 1, z = -5t + 3
Find the value of the variable that satisfies the equation.-6x + x = -30
A. x = -7 B. x = -6 C. x = 7 D. x = 6
Find the foci of the ellipse.
+ 
= 1
A. (-8, 4), (16, 4) B. (-11, 4), (19, 4) C. (-5, 4), (13, 4) D. (4, -8), (4, 16)
Solve.The number of mosquitoes M(x), in millions, in a certain area depends on the June rainfall x, in inches, according to the function 
What rainfall produces the maximum number of mosquitoes?
A. 4 in. B. 2 in. C. 0 in. D. 16 in.