Please help.

Pomona Sprout is teaching about mandrake roots at Hogwarts when three of her students pull up mandrakes that scream at decibel levels of $87.7 dB, 89.5 dB$ and $86.3 dB$ as she stands $2.30 m$ away. What is the combined decibel level that Pomona Sprout hears from the mandrakes? How far away would Pomona Sprout need to be from the three mandrake roots for the combine decibel level to be $89.0 dB$ ?

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Pomona Sprout is teaching about mandrake roots at Hogwarts when three of her students pull up mandrakes that scream at decibel levels of

87.7 dB, 89.5 dB

and

86.3 dB

as she stands

2.30 m

away. What is the combined decibel level that Pomona Sprout hears from the mandrakes? How far away would Pomona Sprout need to be from the three mandrake roots for the combine decibel level to be

89.0 dB

?

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