Find the mass of the wire that lies along the curve r and has density ?.r(t) = (3 cos t)i + (3 sin t)j + 3tk, 0 ? t ? 2?; ? = 10
A. 60?
units
B. 20? units
C. 180?
units
D. 6?
units
Answer: A
Mathematics
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A. 0.1 B. -0.1 C. -1 D. 10
Mathematics
Solve the problem.Is the complex number 
a solution of the equation 
Explain.
A. No; because (2 - 4i)2 - 4(2 - 4i) ? -20 B. Yes; because (2 - 4i)2 - 4(2 - 4i) = -20 C. No; because (2 - 4i)2 - 4 ? -20 D. Yes; because (2 - 4i)2 - 4 = -20
Mathematics
Solve the problem.An airplane is flying in the direction 70° west of north at 674 km/hr. Find the component form of the velocity of the airplane, assuming that the positive x-axis represents due east and the positive y-axis represents due north.
A. 
B. 
C. 
D. 
Mathematics
Graph the equation by plotting points.y = 
A. 
B. 
C. 
D. 
Mathematics