Find the length of the curve.x = 6 sin3 t, y = 6 cos3 t, 0 ? t ? ?
A. 18
B. 36
C. 12
D. 6
Answer: A
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Solve the problem.For the study described below, identify the sample.A researcher is interested in the level of stress among emergency-room nurses in the U.S. 275 emergency-room nurses were interviewed to determine their level of stress. Each nurse was assigned a stress rating based on his or her answers to a number of questions. The average stress rating for the 275 nurses was determined.
A. The 275 emergency-room nurses interviewed B. The average stress rating for the 275 emergency-room nurses interviewed C. All emergency-room nurses in the U.S. D. The questionnaire given to the 275 emergency-room nurses interviewed
Solve the problem.The period of vibration P for a pendulum varies directly as the square root of the length L. If the period of vibration is 4 sec when the length is 64 inches, what is the period when 
(Round to the nearest hundredth.)
A. 5.00 sec B. 4.75 sec C. 1.13 sec D. 4.50 sec
Solve.The weight W of an object on the Moon varies directly as the weight E on earth. A person who weighs 124 lb on earth weighs 24.8 lb on the Moon. How much would a 117-lb person weigh on the Moon?
A. 23.4 lb B. 0.2 lb C. 265.8 lb D. 585 lb
Find the mean.The local Tupperware dealers earned commissions last month of 
, $4997.66, $4707.81, $4477.25, $3657.28, and $1160.43.
A. $4327.28 B. $5424.10 C. $3616.07 D. $4339.28