Solve the problem.A pilot wants to fly on a bearing of E 68.1° N. By flying due east, he finds that a 52-mph wind, blowing from the south, puts him on course. Find the ground speed of the plane.
A. 279 mph
B. 139 mph
C. 209 mph
D. 56 mph
Answer: B
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Solve the problem.Find an equation for the level curve of the function f(x, y) = 100 - x2 - y2 that passes through the point 
.
A. x2 + y2 = 108 B. x2 - y2 = 8 C. x2 + y2 = 8 D. x2 + y2 = - 8
Solve the problem.In a shipment of 11 CD players, two are defective. Find the probability that a sample of 3 CD players will not contain any that are defective.
A. 
B. 
C. 
D. 
Choose the correct response.What is the speed of a plane that travels at a rate of 503 mph into a wind of r mph?
A. r - 503 mph
B. 503 + r mph
C. 
mph
D. 503 - r mph
The concentration (in milligrams/cubic centimeter) of a certain drug in a patient's body t hr after injection is given by
?
interval where 
is decreasing.
?
When is the concentration of the drug increasing and when is it decreasing?
?
A. Increasing on 
B. Increasing on 
and decreasing on 
C. Decreasing on 
D. The concentration of the drug is constant.