Solve.The loudness, D, in decibels of a sound of intensity I is given by D = 10 log (I/I0), where I is measured in watt/m2 and I0 = 10-12 watt/m2. What is the decibel level of a noise whose intensity is 4.87 x 10-5 watt/m2? (Round to the nearest whole number.)
A. 67 decibels
B. 77 decibels
C. 177 decibels
D. 8 decibels
Answer: B
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Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 1; local maximum at x =-1; concave down on (0, ?); concave up on (-?, 0) B. Local maximum at x = 1; local minimum at x =-1; concave up on (0, ?); concave down on (-?, 0) C. Local maximum at x = 1; local minimum at x =-1; concave up on (-?, ?) D. Local minimum at x = 1; local maximum at x =-1; concave up on (0, ?); concave down on (-?, 0)
Find the areas bounded by the indicated curves, using vertical or horizontal elements.y = x3, y = 49x
A. 
B. 1127
C. 
D. 
Provide an appropriate response.
What was the percent of increase in sales from the first to the second quarter? 
A. 110.7% B. 90.3% C. 13.9% D. 9.7%
Find the exact value of the expression.tan 345°
A. 
B. 2 + 
C. -2 - 
D. 