In work with alternating current, complex numbers are used to describe current I, voltage E, and impedance Z. These three quantities are related by the equation E = IZ. Solve the equation E = IZ for the missing variable.I = 6 + 5i, E = 30 + 44i
A. Z = 
- 
i
B. Z = 
+ 
i
C. Z = - 
+ 
i
D. Z = 
+ 
i
Answer: D
Mathematics
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Multiply.(x - 4)(8x2 + x + 7)
A. 8x3 + 31x2 + 3x - 28 B. 8x3 - 33x2 + 3x - 28 C. 8x3 - 31x2 + 3x - 28 D. 8x3 - 31x2 + 11x - 28
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Solve by the substitution method.-0.5x + 0.3y = -2.3-0.7x - 0.1y = -2.7
A. {(x, y)| -0.5x + 0.3y = -2.3} B. {(4, -1)} C. {(-1, 4)} D. ?
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Solve the problem.The current I in an electrical conductor varies inversely as the resistance R of the conductor. The current is 4 amperes when the resistance is 842 ohms. What is the current when the resistance is 803 ohms?
A. 0.26 amps B. 0.24 amps C. 4.2 amps D. 3.8 amps
Mathematics
The perimeter of this pentagon is 280 cm. Find the lengths of the sides.
?
?
A. 
B. 
C. 
D. 
E. 
Mathematics