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. What is the intensity in watt/m2 of a noise measured at 76 decibels? (Round to an appropriate number of significant digits.)
A. 4.0 × 10-4 watt/m2
B. 4.0 × 10-5 watt/m2
C. 2.0 × 1015 watt/m2
D. 7.6 × 10-10 watt/m2
Answer: B
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Solve the problem.To get a B in biology, Katie must have a mean score of 81 on five lab reports. Scores on the first four lab reports were 90, 77, 76, and 83. What is the lowest score that Katie can get on the last lab report and still receive a B?
A. 82 B. 75 C. 79 D. 81
Answer the question or complete the sentence to make a true statement.In order to add -9 and 7, I should begin by finding the of the of -9 and 7.
A. Difference, absolute values B. Sum, opposites C. Difference, additive inverses D. Sum, absolute values
Simplify the rational expression.
A. 
B. 
C. 
D. j+ k
Factor the GCF out of the given expression.-6x3 - 12x2 + 9x
A. -3x(2x2 + 4x - 3) B. -3(2x3 + 4x2 - 3x) C. -3x(2x2 - 4x + 3) D. -6x(x2 + 2x - 3)