Solve the problem.A twin-engined aircraft can fly 960 miles from city A to city B in 4 hours with the wind and make the return trip in 6 hours against the wind. What is the speed of the wind?
A. 80 mph
B. 20 mph
C. 40 mph
D. 60 mph
Answer: C
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Find the indicated probability or percentage for the normally distributed variable.The mean clotting time of blood is 7.35 seconds, with a standard deviation of 
The times are approximately normally distributed. What is the probability that a randomly selected blood clotting time will be less than 7 seconds?
A. 0.363 B. 0.156 C. 0.159 D. 0.841
Determine the value of each variable.
= 
A. a = -3, x = 2 B. a = -3, x = -3 C. a = 2, x = 2 D. a = 2, x = -3
Find the limit algebraically.
(4 - 7x2)
A. -52 B. -444 C. -108 D. 452
Answer the question.If 3 is substituted for x in the rational expression 
, the result is 
. Mathematicians have been known to say "Any number divided by itself is 1." Does this mean that this expression is equal to 1 for x = 3? Explain why or why not.
What will be an ideal response?