Simplify the radical expression by factoring out the largest perfect nth power. Assume that all variables are positive.- 
A. -6xy
B. -6xy
C. 6xy
D. xy
Answer: A
Mathematics
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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 
Mathematics
Solve.log (5x + 5) = 2
A. 
B. 19
C. - 
D. - 19
Mathematics
Write in standard (decimal) form.9.471 × 10-6
A. 0.00009471 B. -9,471,000 C. 0.0000009471 D. 0.000009471
Mathematics
Find the exact value of the expression.cos 15° cos 45° - sin 15° sin 45°
A. 
B. 
C. 
D. 
Mathematics