Solve the problem.In the study of alternating electric current, capacitive voltage is given byVc = - 
cos 2?ft,where f is the number of cycles per second, i is the maximum current, and t is the time in seconds. Solve the equation for t.
A. t = 2?f cos 
B. t = 
arccos 
C. t = 
arccos 
D. t = 2?f arccos 
Answer: B
Mathematics
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Solve for the variable. Choose the method you feel will work best.5x2 + 8x + 1 = 0
A. x = 
B. x = 
C. x = 
D. x = 
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A. $895.00 B. $17,005.00 C. $89.50 D. $17,810.50
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Find the sum of the arithmetic series using a formula.2 + 4 + 6 + ... + 1830
A. 837,225 B. 836,310 C. 838,140 D. 839,056
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