Solve the problem.Between 7:00 AM and 8:00 AM, trains arrive at a subway station at a rate of 10 trains per hour 
per minute). The following formula from statistics can be used to determine the probability that a train will arrive within t minutes of 7:00 AM. F(t) = 1 - e-0.17tDetermine how many minutes are needed for the probability to reach 60%.
A. 2.02 min
B. 5.25 min
C. 7.34 min
D. 5.39 min
Answer: D
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Solve the problem.Find the equation for the tangent plane to the surface 
at the point 
A. x + y + z = 5 B. x + y + z = 1 C. -7x - 7y + 9z = 5 D. -7x - 7y + 9z = 1
Determine if the argument is valid or invalid. Give a reason to justify answer.If the bough breaks, then the cradle will fall.The bough breaks. ? The cradle will fall.
A. Invalid by fallacy of the converse B. Valid by the law of syllogism C. Invalid by fallacy of the inverse D. Valid by the law of detachment
Find the area or volume.Find the area of the region in the first quadrant between the curve y = e-6x and the x-axis.
A. 1
B. 
e
C. 
D. 6
Solve the problem.Assume that G is a graph with 10 vertices. It is known that one vertex has degree 9 and the other vertices each have degree 1. What can be said about G?
A. G is not a tree. B. It is impossible to tell if G is a tree or not. C. G is a tree. D. G has no bridges. E. none of these