Solve the problem.When an alternating current passes through a series RLC circuit, the voltage and current are out of phase by angle ?. Here ? = tan-1[(XL - XC)/R], where XL and XC are the reactances of the inductor and capacitor, respectively, and R is the resistance. Find d?/dR for constant XL and XC.
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Change to a percent.
A. 9
%
B. 1
%
C. 10
%
D. 93
%
Mathematics
Graph the inequality.-3x - 4y ? 12
A. 
B. 
C. 
D. 
Mathematics
Use the summation properties to evaluate the series. The following rules may be needed: 
. 
A. 57 B. 51 C. 39 D. 63
Mathematics
For the pair of functions, find the indicated sum, difference, product, or quotient.F(x) = x2 + 1 and G(x) = 3x - 5.Find (F ? G)(x).
A. 3x3 - 5 B. 3x3 + 3x2 - 5x - 5 C. 3x2 + 3x - 5 D. 3x3 - 5x2 + 3x - 5
Mathematics