Can someone help with this. will give brainliest:)

The loudness, L, measured in decibels (Db), of a sound intensity, I, measured in watts per square meter, is defined as L = 10 lo

slamgirl [31]

Answer:

$db_1 = 10 log_{10} (\frac{10^{-9}}{10^{-12}})= 30 db$

And using the same formula we can find the number of decible for the Braylee's music:

$db_2 = 10 log_{10} (\frac{10^{-3}}{10^{-12}})= 90 db$

And since we want to find how many times louder is Braylee’s music than Jessica’s we can find the following relationship:

$\frac{db_2}{db_1} = \frac{90 dB}{30 dB}= 3$

So then we can conclude that the Braylee's music is 3 times louder then the Jessica's sound. And the best option would be:

3 times louder

Step-by-step explanation:

For this case we know that the loudness measured in decibels is given by this formula:

$dB = 10 log_{10} (\frac{I}{I_o})$

Where $I_o = 10^{-12} W/m^2$ . Using this formula we can find the decibels for the sound for Jessica:

$db_1 = 10 log_{10} (\frac{10^{-9}}{10^{-12}})= 30 db$

And using the same formula we can find the number of decible for the Braylee's music:

$db_2 = 10 log_{10} (\frac{10^{-3}}{10^{-12}})= 90 db$

And since we want to find how many times louder is Braylee’s music than Jessica’s we can find the following relationship:

$\frac{db_2}{db_1} = \frac{90 dB}{30 dB}= 3$

So then we can conclude that the Braylee's music is 3 times louder then the Jessica's sound. And the best option would be:

3 times louder

3 0

3 years ago

A bag contains 40 marbles, 4 of which are blue, 10 are red, 25 are green, and 1 is purple. Shawna takes a marble out of the bag,

tia_tia [17]

25/40=62.5% of green.
400*.625=250 green marbles.

6 0

4 years ago

During a sale at a bookstore, a customer buys one book at full price. The customer is given a 25% percent discount on a second b

shusha [124]

The starting prices for both of the books are at 100%, and taking 25% from the second book it would be 75%. You will have 75% of each value of the books while they're on sale, which you can convert to decimal .75. Multiply this decimal by each of the books' values to figure out how much they'll be on sale and then add them, which would total up to 36 + 18= 54$. By dividing this value by the book's original value, 60$, would equal it to .9. Converting the .9 to a percent and subtracting it by 100%, It's reduced by 10%.

7 0

3 years ago

Solve for y ; -2y - 2x =4

Deffense [45]

I think this is what you want to do

Your welcome