Solve the problem.The time to failure t, in hours, of a certain machine can often be assumed to be exponentially distributed with probability density function f(t) = ke-kt, 0 ? t < ?, where k = 
and a is the average amount of time that will pass before a failure occurs. Suppose the average amount of time that will pass before a failure occurs is 87 hours. What is the probability that a failure will occur in 43 hours or less?
A. 0.4680
B. 0.3120
C. 0.3900
D. 0.2925
Answer: C
Mathematics
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Add or subtract as indicated.-14 + (-16)
A. 2 B. 30 C. -30 D. -2
Mathematics
Compare the integers. Insert < or > to make the statement true.6 
0
A. > B. <
Mathematics
Solve the problem.If (-1, -1) is the endpoint of a line segment, and (-4, -3) is its midpoint, find the other endpoint.
A. (-5, -7) B. (-7, -5) C. (5, 3) D. (-7, 1)
Mathematics
Find the values of 
for which 
satisfies the equation 
What will be an ideal response?
Mathematics