In a manufacturing process involving several machines, the average down time t (in hours) for a machine that needs repair has the probability density function 
. Find the probability that a failed machine's down time is 4 hours or more. Round your answer to three decimal places.
?
A. 0.865
B. 0.998
C. 0.145
D. 0.135
E. 0.002
Answer: D
Mathematics
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A. y = 2
B. - 
x + y = 2
C. x = - 
D. - 
x + 2y = 0
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Solve.6x2 + 8x + 1 = 0
A. 
, 
B. 
, 
C. 
, 
D. 
, 
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Factor.10x2 + 2x
A. x(10x + 2) B. 2(5x2 + x) C. 2(5x2 - x) D. 2x(5x + 1)
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Evaluate the expression for the given value or values.- 
, for y = -45, z = 5
A. -5 B. 9 C. 5 D. -9
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