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Math·Advanced Math·Nonlinear functions

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An acceptable noise criterion rating for the background noise in a laundry room is $50$. For a noise criterion rating of $50$, the equation $y=22(0.997{)}^{x-60}+47$ gives the estimated sound pressure level, $y$, in decibels, as a function of the octave band center frequency, $x$, in hertz, where $x\ge 60$. Which of the following is the best interpretation of $47$ in this context?

A

47 is 22 less than the estimated sound pressure level, in decibels, at an octave band center frequency of 60 hertz.

B

47 is 22 less than the estimated sound pressure level, in decibels, at an octave band center frequency of 0 hertz.

C

47 is the estimated sound pressure level, in decibels, at an octave band center frequency of 60 hertz.

D

47 is the estimated sound pressure level, in decibels, at an octave band center frequency of 0 hertz.