Answer the question.If k < 0, what is the solution set of 
= k
A. {
}
B. (-?, ?)
C. {0}
D. ?
Answer: D
Mathematics
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Solve the problem.Evaluate 
by transforming to cylindrical or spherical coordinates.
A. 
?
B. 256?
C. 128?
D. 
?
Mathematics
Solve the problem.At a fixed temperature, the resistance R of a wire varies directly as the length l and inversely as the square of its diameter d. If the resistance is 1.25 ohm when the diameter is 1 mm and the length is 250 cm, what is the resistance when the diameter is 2 mm and the length is 720 cm?
A. 225 ohm B. 0.9 ohm C. 1.8 ohm D. 180 ohm
Mathematics
Solve the equation.3x = 81
A. 27 B. 5 C. 4 D. 3
Mathematics
Find the transpose of the matrix.
A. 
B. 
C. 
D. 
Mathematics