Solve the problem.What is the intensity in watt/m2 of a noise measured at 75 decibels? 
where S0 is 10-12 watt/m2. (Express in scientific notation, and round to three significant digits.)
A. 7.5 × 10-10 watt/m2
B. 3.16 × 10-4 watt/m2
C. 1.81 × 1015 watt/m2
D. 3.16 × 10-5 watt/m2
Answer: D
Mathematics
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Write the series with summation notation.0 + 2 + 6 + 12 + 20
A. 
B. 
C. 
D. 
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Graph the parabola and label the vertex. Find the y-intercept.y = 4(x + 1)2 + 
A. vertex 
, y-intercept (0, -7.5)
B. vertex 
, y-intercept (0, 0.5)
C. vertex 
, y-intercept (0, 7.5)
D. vertex 
, y-intercept (0, 7.5)
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Express the graph shown using interval notation. Also express it as an inequality involving x.
A. [4, 7) 4 ? x < 7 B. [4, 7] 4 ? x ? 7 C. (4, 7] 4 < x ? 7 D. (4, 7) 4 < x < 7
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Evaluate the expression without using a calculator.(-1)2/7
A. 1
B. 0
C. -1
D. - 
Mathematics