The decibel level D of a sound is defined as  figure 1.png)
where I is the intensity of the sound measured in watts per square meter, and I? is the intensity of the least audible sound, standardized to be I? = 10^–12 watts per square meter.
A rock concert has a volume with an intensity of I = 1.0 × 10^–1 W/m². Find its rating in decibels.
110 dB
Mathematics
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Solve by completing the square to obtain exact solutions.x2 = 9 - 4x
A. -1 ± 
B. -2 ± 
C. 2 + 
D. -2 ± 2
Mathematics
Evaluate the expression.2x2 + 4y, where x = 5 and y = -6
A. 92 B. 26 C. 76 D. -348
Mathematics
Find the product. Simplify before performing the multiplication.
? 
A. 
B. 
C. 
D. 
Mathematics
Write as a decimal number rounded as indicated.2.3
; Round to the nearest hundredth.
A. 2.32 B. 2.33 C. 2.34 D. 2.31
Mathematics