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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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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Solve the logarithmic equation. Be sure to reject any value that is not in the domain of the original logarithmic expressions. Give the exact answer.log6 (x2 - 5x) = 1

A. {-6, 1} B. {1} C. {6} D. {6, -1}

Mathematics