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 = 2?f cos 
B. t = 2?f arccos 
C. t = 
arccos 
D. t = 
arccos 
Answer: D
Mathematics
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Estimate the answer by rounding as indicated.Estimate by rounding to the nearest hundred.
A. 3032 B. 3000 C. 2900 D. 3030
Mathematics
Provide an appropriate response.Subtract and reduce when necessary: 
- 
A. 
B. 
C. 
D. 
Mathematics
Perform the indicated operation(s). Simplify if possible.
- 
+ 
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.The half-life of silicon-32 is 710 years. If 30 grams is present now, how much will be present in 300 years? (Round your answer to three decimal places.)
A. 22.383 B. 1.604 C. 29.134 D. 0
Mathematics