Solve the problem.A jet plane traveling at a constant speed goes 1200 mi with the wind, then turns around and travels for 1000 mi against the wind. If the speed of the wind is a constant 50 mph, and the total flight took 4 hours, find the speed of the plane.
A. 550 mph
B. 435 mph
C. 525 mph
D. 605 mph
Answer: A
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Find the Jacobian 
or 
(as appropriate) using the given equations.
A. 972u B. 972v C. 648u D. 648v
Solve the problem.Doctors predict that by administering a vaccine, the number of new cases of a certain childhood disease will decrease by half each year. If 900 people were afflicted with the disease in 2012, estimate the number of new cases in 2017. Round to the nearest whole number.
A. 14 new cases B. 56 new cases C. 113 new cases D. 28 new cases
Use the shell method to find the volume of the solid generated by revolving the shaded region about the indicated axis.About the y-axisx = 4
A. 40? B. 48? C. 20? D. 32?
Solve.A special type of wire used in electronic equipment is 0.726 millimeter thick. How many centimeters thick is the wire?
A. 72.6 cm B. 0.00726 cm C. 0.0726 cm D. 7.26 cm