Solve the polynomial equation by factoring.x4 - 81 = 0
A. 9, -9
B. 6, -6
C. 3, -3
D. 18, -18
Answer: C
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Find the equation of the normal line to the indicated curve at the given point.x2 - y2 = 40 at (-7, 3)
A. 3x - 7y - 42 = 0 B. 3x + 7y - 42 = 0 C. 3x - 7y + 42 = 0 D. 3x + 7y + 42 = 0
Tell whether the angle is acute, right, obtuse, straight, or reflex.
A. Obtuse B. Acute C. Straight D. Zero
Solve using matrices. -5x - y - 3z = -455x + 4y - 7z = -21 -7x - 6y + z = -53
A. (2, 8, 9) B. (-2, 8, 4) C. (2, 9, 8) D. (4, 8, -2)
Solve the problem.If a tone is formed from the combination of two component frequencies, F1 and F2 , as is done with touch-tone phones, then the tone can be represented as 
if the intensities of the components are equal. For the two component frequencies 
and 
rewrite this expression as a product of trigonometric functions and graph the result in 
-4.0px;" /> by 
A. 2 cos(995?t) cos(995?t)
[0, .005, .001] by [-2, 2, 1]
B. 2 cos(995?t) cos(265?t)
[0, .005, .001] by [-2, 2, 1]
C. 2 cos(1990?t) cos(1990?t)
[0, .005, .001] by [-2, 2, 1]
D. 2 cos(1990?t) cos(530?t)
[0, .005, .001] by [-2, 2, 1]