Solve the problem.In the study of alternating electric current, capacitive voltage is given by 
, 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 = 
arccos 
B. t = 
arccos 
C. t = 2?f arccos 
D. t = 2?f cos 
Answer: B
Mathematics
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Find the domain of the function.y = 
A. [4, ?) B. all real numbers except 4 C. (-?, ?) D. (4, ?)
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Graph the function.f(x) = 
A. 
B. 
C. 
D. 
Mathematics
Find all real solutions to the equation.
= x - 7
A. {12} B. {3} C. {-9} D. {3, 12}
Mathematics
Solve and check your solutions.
x = 9
A. x = 27 B. x = 11 C. x = 3 D. x = 12
Mathematics