Find the vertex of the given parabola.f(x) = 9x2 - 72x + 146
A. (4, 0)
B. (4, 2)
C. (2, 4)
D. (2, 0)
Answer: B
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Solve the problem.Scores on a test are approximately normally distributed with a mean of 70 and a standard deviation of 9. The teacher wants to give A's to the top 10% of students, B's to the next 25%, and C's to the next 42%. What is the bottom cutoff for a C grade? Round your answer to the nearest whole number.
A. 77 B. 63 C. 65 D. 68
Solve the inequality. Express your answer using interval notation.|x - 5| - 1 ? 2
A. [2, 8] B. no solution C. (-?, 2) or (8, ?) D. [-2, 2]
Solve the problem.BJ can overhaul a boat's diesel inboard engine in 30 hours. His apprentice takes 60 hours to do the same job. How long would it take them working together assuming no gain or loss in efficiency?
A. 12 hr B. 8 hr C. 90 hr D. 20 hr
Solve the inequality.28(x2 - 1) > 33x
A. 
or 
B. 
or 
C. 
D. 