Solve the problem.Use the formula D = 10.0 log (S/S0), where the loudness of a sound in decibels is determined by S, the number of watt/m2 produced by the soundwave, and S0 = 1.00 × 10-12 watt/m2. A certain noise produces 5.1 × 10-4 watt/m2 of power. What is the decibel level of this noise? (Round to an appropriate number of significant digits.)
A. 200 decibels
B. 77 decibels
C. 9 decibels
D. 87 decibels
Answer: D
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Solve the equation by completing the square.x2 + 4x = 3
A. {-2 ± 
}
B. {2 + 
}
C. {-2 ± 2
}
D. {-1 ± 
}
Find an equation of the line satisfying the following conditions.If possible, write the equation in slope-intercept form. Through (6, 5), perpendicular to 6x + 5y = 11
A. y = 
x + 0
B. y = 
x + 
C. y = - 
x - 0
D. y = 
x - 
Write the number in scientific notation.6,375,000,000
A. 6.375 × 109 B. 637.5 × 107 C. 6375 × 106 D. 6.375 × 106
Provide an appropriate response.Finish the statement with a correct response. To divide two fractions one needs to:
A. Use the reciprocal of the second fraction (divisor), add the numerators and multiply the denominators. B. Use the reciprocal of the second fraction (divisor) and multiply. C. Add the numerators and multiply the denominators. D. Add the numerators and factor the denominators.