In electrical circuits, the impedance Z (or opposition to the flow of electricity), voltage V, and current I can all be represented by complex numbers. They are related by the equation Z = 
. Use this equation to find the value of the missing variable.V = 56 - 42i, I = 4 + 2i
A. Z = 4 + 26i
B. Z = 4 - 26i
C. Z = 7 - 14i
D. Z = 7 + 14i
Answer: C
Mathematics
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A. 
B. 
C. 
D. 
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Rewrite as a radical expression and simplify if possible. Assume all variables represent nonnegative real numbers.(x3)8/3
A. x4 B. x9 C. x3 D. x8
Mathematics
Given the graph of f, find any values of x at which f ' is not defined.
A. x = 0 B. x = -2, 0, 2 C. x = -2, 2 D. Defined for all values of x
Mathematics
Use the given feasible region determined by the constraint inequalities to find the maximum possible value of the objective function.f = 7x + 6y subject to the constraints 
A. 275 B. 405 C. 385 D. 231
Mathematics