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.Z = 9 + 4i, E = 25 + 48i
A. I = 
+ 
i
B. I = 
+ 
i
C. I = 
+ 
i
D. I = 
+ 
i
Answer: D
Mathematics
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Use properties to perform the calculations. Express answer in simplest form.14
- 
A. 13
B. 12
C. 13
D. 14
Mathematics
Find the center and the radius of the circle.3x2 + 3y2 + 6x - 12y - 60 = 0
A. (-1, 2), r = 5 B. (-2, 1), r = 25 C. (1, -2), r = 25 D. (2, -1), r = 5
Mathematics
Solve the problem.Estimate graphically the local maximum and local minimum of 
A. Local maximum: 9.20; local minimum: 1.06 B. Local maximum: -2.79; local minimum: 0 C. Local maximum: 7.86; local minimum: 1 D. Local maximum: 8.65; local minimum 0.91
Mathematics
Express in terms of logarithms of a single variable or a number.logn
A. 
logn 2 + 
logn x + 
logn z
B. 
logn 2 - 
logn x - 
logn z
C. 
logn 2 + 7 logn x - 3 logn z
D. 
logn 2 + 
logn x - 
logn z
Mathematics