Factor completely.r2 + 3r - 4
A. (r + 4)(r - 1)
B. (r - 4)(r + 3)
C. (r - 4)(r + 1)
D. Prime
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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SD( X )
The random variable X has the probability density function
over [0, ?).
Compute the following quantities.
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