Solve the problem.In simplified form, the period of vibration P for a pendulum varies directly as the square root of its length L. If P is 2.25 sec. when L is 81 in., what is the period when the length is 121 in.?
A. 30.25 sec
B. 484 sec
C. 2.75 sec
D. 44 sec
Answer: C
Mathematics
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C. sin-1 
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D. 
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? 0
A. [-2, 2] B. ? C. (-?, ?) D. (-?, -2) ? (-2, ?)
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