Find an equation for the graph.
A. y = 
cos (4x)
B. y = 
cos 
C. y = 
cos 
D. y = cos (4x)
Answer: A
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Solve the system of equations. x - y + 2z = -14x + z = -1 x + 5y + z = -6
A. (-1, -1, 0) B. No solution C. (0, -1, -1) D. (-1, 0, -1)
Find the center, foci, and vertices of the ellipse.16(x + 1)2 + 9(y - 3)2 = 144
A. center at (3, -1)
foci at (3, -1 - 
), (3, -1 + 
)
vertices at (3, 7), (3, -1)
B. center at (0, 3)
foci at (0, 3 - 
), (0, 3 + 
)
vertices at (0, 7), (0, -1)
C. center at (-1, 3)
foci at (-1, 3 - 
), (-1, 3 + 
)
vertices at (-1, 7), (-1, -1)
D. center at (1, 3)
foci at (1, 3 - 
), (1, 3 + 
)
vertices at (1, 7), (1, -1)
Rationalize the denominator. 
A. 
B. 
C. 
D. 
Solve the problem.Bert is 22 kilometers away from Brenda. Both begin to walk toward each other at the same time. Bert walks at 3.5 kilometers per hour. They meet in 4 hours. How fast is Brenda walking?
A. 4 kilometers per hour B. 3 kilometers per hour C. 3.5 kilometers per hour D. 2 kilometers per hour