Solve the problem.Given that the polar equation r = 
models the orbits of the planets, estimate the smallest possible distance between Earth, for which 
and 
and Venus, for which 
and 
A. About 2 astronomical units
B. Zero astronomical units
C. About 0.4 astronomical units
D. About 0.2 astronomical units
Answer: D
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Find the prime factorization of the number.126
A. 2 ? 2 ? 3 ? 3 ? 7 B. 2 ? 3 ? 3 ? 7 C. 2 ? 3 ? 7 D. 14 ? 3 ? 3
Evaluate the integral.
A. 
sin-1 
x + C
B. 
sec-1 
+ C
C. 
sec-1 
+ C
D. 
sec-1 
+ C
Find the domain of the composite function f?g.f(x) = x + 2, g(x) = 
A. (-?, -5) ? (-5, -2) ? (-2, ?) B. (-?, ?) C. (-?, -7) ? (-7, ?) D. (-?, -5) ? (-5, ?)
Solve the problem.The impedance Z, in ohms, of a circuit element is defined as the ratio of the phasor voltage V, in volts, across the element to the phasor current I, in amperes, through the element. That is, Z = 
. If the voltage across a circuit element is 
and the current through the element is 
what is the impedance?
A. 
ohms
B. 
ohms
C. 
+ 
i ohms
D. 
+ 
i ohms