Factor by grouping.2x3 - 10x2 - 3x + 15
A. (2x2 + 3)(x + 5)
B. (2x2 - 3)(x + 5)
C. (2x2 + 3)(x - 5)
D. (2x2 - 3)(x - 5)
Answer: D
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Subtract and simplify.
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A. 
B. 
C. 
D. 
Solve the system by using the inverse of the coefficient matrix. x + y + z = 4 x - y + 4z = -195x + y + z = 24
A. No solution B. (-5, 4, 5) C. (-5, 5, 4) D. (5, 4, -5)
Find the average rate of change of the function on the given interval. f(x) = -5x + 5, [-5, -2]
A. 4 B. -5 C. 5 D. -6
The life expectancy of a fluorescent light bulb is given by the number of hours that it will burn. From the frequency distribution below, find the mean life of this type of bulb. Please round your answer to the nearest tenth. Life of Bulb(hours)MidpointxFrequencyfProductxf0.5 - 700.5 2 700.5 - 1,400.5 12 1,400.5 - 2,100.5 14 2,100.5 - 2,800.5 17 2,800.5 - 3,500.5 28 3,500.5 - 4,200.5 33 4,200.5 - 4,900.5 14 4,900.5 - 5,600.5 5
A. mean = 3,067.4 hours B. mean = 3,077.7 hours C. mean = 3,083.2 hours D. mean = 3,082.8 hours E. mean = 3,062.2 hours