Use the decibel scale to answer the question.How does the intensity of sound form a concert speaker at a distance of 1 meter compare to the intensity at a distance of 900 meters?
A. Factor of 2700 weaker at 900 m.
B. Factor of 10900 weaker at 900 m.
C. Factor of 900 weaker at 900 m.
D. Factor of 810,000 weaker at 900 m.
Answer: D
Mathematics
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Subtract.1,286
A. 7 B. 1,007 C. 995 D. 855
Mathematics
Simplify by writing the expression with positive exponents. Assume that all variables represent nonzero real numbers.t-7 ? t4 ? t-6
A. 
B. 
C. t9
D. t17
Mathematics
Find the indicated matrix.Let B = [-1 4 4 -3]. Find -2B.
A. [2 -8 -8 6] B. [2 4 4 -3] C. [-3 2 2 -5] D. [-2 8 8 -6]
Mathematics
Find an equation for the line with the given properties.Perpendicular to the line y = -3x - 1; containing the point (1, 3)
A. y = 3x + 
B. y = - 
x + 
C. y = -3x + 
D. y = 
x + 
Mathematics