Solve the problem.For two sections of a circuit connected in series, the voltage is given by V = V1 + V2 and impedance by Z = Z1 + Z2. The current is given by I = V/Z. Calculate the voltage if 
and 
A. 38.13 - 0.04i V
B. 31.8 - 0.04i V
C. 11.83 - 3.56i V
D. 11.83 + 3.56i V
Answer: D
Mathematics
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A. -6
B. 
C. 80
D. - 
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Find the unit tangent vector of the given curve.r(t) = (8 sin3 7t)i + (8 cos3 7t)j
A. T(t) = (sin 7t)i - (cos 7t)j B. T(t) = (8 cos 7t)i - (8 sin 7t)j C. T(t) = (8 sin 7t)i - (8 cos 7t)j D. T(t) = (168 sin 7t)i -(168 cos 7t)j
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Write the given set in interval notation and graph the set on a number line.{x|x < -4}
A. (-4, ?)
B. (-?, -4]
C. (-?, -4)
D. [-4, ?)
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Simplify the expression.(
+ 1)(
- 1)
A. 2 - 2
B. 2
C. 2 + 2
D. 4
Mathematics