tierann46

25.01.2021 • 

Mathematics

The loudest animal on Earth is the blue whale. Blue whales can emit sound with an intensity of 106.8 watts/meter. The equation B = 10 log() relates the sound level, B, in decibels (dB), of a nolse with an intensity of I to the smallest sound intensity that can be heard

by the human ear, 10 (approximately 1 x 10–12 watts/meter?).

Based on this information, which value is closest to the sound level, in decibels, of the vocalizations of a blue whale?

OA.

240 dB

OB.

1,000 dB

Ос.

140 dB

OD

100 dB

Ответ:

cici86

17.04.2023

Mathematics

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5 x - 1 + 13 - x = 24
4 x + 12 = 24
4 x = 24 - 12
4 x = 12
x = 3
The perimeter of WXYZ: 2 ( XY + YZ ) = 2 ( 5 x - 1 ) = 2 ( 5 · 3 - 1 ) = 
2 ( 15 - 1 ) = 2 · 14 =  28 

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