If n is an integer, n ? 180° represents an integer multiple of 180°, and 
represents an odd integer multiple of 90°. Decide whether the expression is equal to 0, 1, -1, or is undefined. cos((2n + 1) ? 90°)
A. 1
B. -1
C. Undefined
D. 0
Answer: D
Mathematics
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?
?
A. 
B. 
C. 
D. 
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Solve the equation.
+ 
= 4
A. {3}
B. ?
C. {-3}
D. 
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Solve the formula for the specified variable.Solve: D = 
(mx - mb) for m
A. m = 
B. m = 
C. m = 
D. m = 
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Solve the problem.Given f(x) = -(x + 4)2, find f(1).
A. -25 B. 10 C. 25 D. -9
Mathematics