Complex numbers are used in electronics to describe the current in an electric circuit. Ohm's law relates the current in a circuit, I, in amperes, the voltage of the circuit, E, in volts, and the resistance of the circuit, R, in ohms, by the formula 
Solve the problem using this formula.Find E, the voltage of a circuit, if I = (8 + 9i) amperes and R = (4 + 7i) ohms.
A. (92 - 31i) volts
B. (92 + 31i) volts
C. (-31 + 92i) volts
D. (-31 - 92i) volts
Answer: C
Mathematics
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A. t = 
B. t = 
C. t = 
D. t = P - Ir
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Evaluate the given expression.1001/2
A. 
B. 50
C. 10
D. 
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Evaluate the expression for the given values.-4xy + 9y - 4
x = 1, y = -3
A. -43 B. -15 C. -19 D. -11
Mathematics
Answer the question.Which number can serve as a common denominator for 
and 
?
A. 15 B. 8 C. 16 D. 63
Mathematics