Factor completely. If the polynomial cannot be factored, write "prime."8c3 + 125
A. (2c + 5)(4c2 + 25)
B. (2c + 5)(4c2 - 10c + 25)
C. (8c + 5)(c2 - 10c + 25)
D. (2c - 5)(4c2 + 10c + 25)
Answer: B
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Factor completely. If a polynomial cannot be factored, say it is prime.x3 - 512
A. (x + 512)(x + 1)(x - 1) B. (x - 8)(x2 + 64) C. (x + 8)(x2 - 8x + 64) D. (x - 8)(x2 + 8x + 64)
Solve the problem.A boat can go 30 mph in still water. It takes as long to go 180 miles upstream as it does to go downstream 270 miles. How fast is the current?
A. 6 mph B. 9 mph C. 1 mph D. 5 mph
Solve the equation by completing the square.x2 + 14x + 30 = 0
A. {7 + 
}
B. {-7 - 
, -7 + 
}
C. {7 - 
, 7 + 
}
D. {-14 + 
}
Solve the problem.Participants in a memorization experiment were able to recall an average of D digits in t minutes, where 
Estimate the number of digits recalled after 9 minutes.
A. 104 digits B. 44 digits C. 64 digits D. 84 digits