Factor completely using the grouping method to factor trinomials. If unfactorable, indicate that the polynomial is prime.12x2 - 42x - 24
A. (12x - 6)(x + 4)
B. 6(2x - 1)(x + 4)
C. 6(2x + 1)(x - 4)
D. prime
Answer: C
Mathematics
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+ 
A. 
B. 1
C. 
D. 
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- 
A. 
B. 
C. 
D. 
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Solve the problem.Jeff takes 5 hours longer to build a fence than it takes Bill. When they work together, it takes them 6 hours. How long would it take Bill to do the job alone?
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