If a person plays an electric guitar outside, the sound level f(d) (in decibels) at a distance

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If a person plays an electric guitar outside, the sound level f(d) (in decibels) at a distance d yards from the amplifier is described by the equation f(d) = 5760d-2.
a. Simplify the right-hand side of the equation.
b. Find f(8). What does your result mean in this situation?
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