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 = 76 - 32i, I = 8 + 4i
A. Z = 
- 17i
B. Z = 6 - 7i
C. Z = 6 + 7i
D. Z = 
+ 17i
Answer: B
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Use the Trapezoidal Rule with n = 4 steps to estimate the integral.
A. 13
B. 52
C. 26
D. 
Find a general term an for the geometric sequence.a1 = 
and r = 6
A. an = 
? 6(n-1)
B. an = 
+ 
(n - 1)
C. an = 
n-1+ 
D. an = 
+ 6(n - 1)
Write the decimal in words.3.00486
A. three and four hundred eighty-six millionths B. three and four hundred eighty-six tenths C. three and four hundred eighty-six hundred-thousandths D. three and four hundred eighty-six thousandths
Find an equation that shifts the graph of f by the indicated amounts.f(x) = x2 + 2x - 7; left 2 units, down 18 units
A. y = (x - 2)2 + 2(x - 2) + 25 B. y = (x + 2)2 + 2(x + 2) - 25 C. y = (x + 2)2 + 2(x - 2) - 25 D. y = (x - 2)2 + 2(x + 2) + 25