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tiny-mole [99]
3 years ago
8

How many decibels is this? show work​

Mathematics
1 answer:
slavikrds [6]3 years ago
4 0

Answer:

  • <u>115 dB</u>

Explanation:

<u>1. Given equation:</u>

\beta =10log(\frac{I}{I_0})\\\\ I_0=10^{-12}W/m^2

<u>2. Given intensity:</u>

I=0.315W/m^2

<u>3. Decibels</u>

\beta =10log(0.315/10^{-12})\\ \\ \beta =10log(315,000,000,000)\\ \\ \beta =10(11.498)=114.98\approx 115

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Three students used factoring to solve a quadratic equation.
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Answer:

The solution was solved correctly by Keith

The solutions of the equation are x=-5,x=-12

Step-by-step explanation:

we have

x^{2}+17x+72=12

Group terms that contain the same variable, and move the constant to the opposite side of the equation

x^{2}+17x=12-72

x^{2}+17x=-60

Complete the square. Remember to balance the equation by adding the same constants to each side.

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Rewrite as perfect squares

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The solution was solved correctly by Keith

The solutions of the equation are x=-5,x=-12

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In the second part,

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