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hoa [83]
3 years ago
15

Nina ran 12 4/5 laps in 1/4 of an hour. At this rate, how many laps could she run in an hour? (Simplify your answer completely)

Mathematics
1 answer:
kozerog [31]3 years ago
5 0

i think the answer is 42 but i don’t know how to get in into its smallest form but i hope this helps

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One of the loudest sounds in recent history was that made by the explosion of Krakatoa on August 26-27, 1883. According to barom
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Answer:

150.51 dB

Step-by-step explanation:

Data provided in the question:

decibel level of sound at 161 km distance = 180 dB

d₁ = 161 km

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The formula for intensity of sound is given as:

I = 10\log(\frac{I_2}{I_1})

and the relation between intensity and distance is given as:

I ∝ \frac{1}{d^2}

or

Id² = constant

thus,

I₁d₁² = I₂d₂²

or

\frac{I_2}{I_1}=\frac{d_1}{d_2}

therefore,

I = 10\log(\frac{d_1}{d_2})^2

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I = 10\times2\times\log(\frac{161}{4,800})

or

I = 20 × (-1.474)

or

I = -29.49

Therefore,

the decibel level on Rodriguez Island, 4,800 km away

= 180 - 29.49

= 150.51 dB

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