Indicate whether the statement is true always, sometimes, or never.When i is raised to an even power, the result is -1.
A. Always
B. Sometimes
C. Never
Answer: B
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Solve the problem.The revenue received from the sale of electric heaters is seasonal, with maximum revenue in the winter. Let the revenue received from the sale of heaters be approximated by R(x) = 92 cos 2?x + 600, where x is time in years, measured from January 1. Find R'(x) for August 1st.
A. 92?
B. 0
C. 92?
D. 92?
Refer to the figure to classify the statement as true or false.
and 
are perpendicular to the plane BEF.
A. True B. False
Look at the circuit shown below. Find X.
a. Ä
ABC
b. ÄÄÄ
Ä
ABC
c. ÄÄÄ
ABC
d. ÄÄ
Ä
ABC
e. Ä
ÄÄ
ABC
Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, let the last variable be the arbitrary variable. 4x - y + 4z = 58 9x + 3y + 5z = 130 3x - 8y + z = -16
A. ? B. {(8, 6, 8)} C. {(8, 8, 6)} D. {(-8, 6, 16)}