Solve the problem.The intensity of a certain noise is 6.71 × 10-9 W/cm2. How loud, in decibels, is this sound level? Use the formula 
where 
(Round to the nearest decibel.)
A. 87 decibels
B. -4 decibels
C. 78 decibels
D. 89 decibels
Answer: C
Mathematics
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-- - AB + AB + AB.
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Verify the identity.sec 4 x - tan 4 x = sec 2 x + tan 2 x
What will be an ideal response?
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Mathematics