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3 years ago

11

So I need help with this because I had did it but the teacher said to redo it but I forgot the answers,

1 answer:

cricket20 [7]3 years ago

4 0

I’ll answer the first question, what’s 3 plus 13? 16 that’s your answer

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What is 5.48 million is scientific notation

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Answer:

5.48x10~6

Step-by-step explanation:

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4 years ago

Elfie had 3 gifts. each gift had 4 items inside. how many items were there in all? math worksheets

meriva

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Each gift contained 4 items, and Elfie had 3 gifts. Use multiplication to solve:

3 × 4 = 12

There were 12 items in all.

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3 years ago

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Serena will get $13.00 in change from the 20 dollar bill.

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3 years ago

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What is the decibel level of a dog barking with intensity 10−5 watts per square inch? Use a logarithmic model to solve.

Vsevolod [243]

Answer:

The sound intensity is about 101.9 dB

Step-by-step explanation:

Sound intensity is the amount of sound energy per unit area.

The intensity of the dog bark is 10⁻⁵ W/in². The intensity of sound in decibels is given by:

$\beta=10\ dB*log(\frac{I}{I_o} )\\\\Where\ I=Sound\ intensity\ in \ W/m^2, I_o=reference\ sound\ intensity=10^{-12}\ W/m^2\, \beta= sound\ intensity\ in\ dB$

I = 10⁻⁵ W/in² = 0.0155 W/m²

Therefore:

$\beta=10\ dB*log(\frac{I}{I_o} )\\\\\beta=10\ dB*log(\frac{0.0155}{10^{-12}} )\\\\\beta=101.9\ dB$

The sound intensity is about 101.9 dB

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3 years ago