The loudness L(x), measured in decibels, of a sound of intensity x, measured in watts per square meter, is defined as 
watt per square meter is the least intense sound that a human ear can detect. Determine the loudness, in decibels, of the sound.A particular Boeing 747 jetliner produces noise at a loudness level of 113 decibels. Find the intensity level (round to the nearest hundredth) in watt per square meter for this noise.
A. 0.80 watt per square meter
B. 0.20 watt per square meter
C. 0.10 watt per square meter
D. 0.40 watt per square meter
Answer: B
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Given that the x- and y-coordinates of a moving particle are given by the indicated parametric equations, find the magnitude and direction of the velocity for the specific value of t.x = 6t2 - 5t + 3, y = -4t2 + 7t - 9, t = 3
A. 35.36, 151.3° B. 51.40, 331.3° C. 35.36, 331.3° D. 51.40, 151.3°
Find the probability. Round to the nearest ten-thousandth when necessary.A family has five children. The probability of having a girl is 1/2. What is the probability of having at least 4 girls?
A. 0.1875 B. 0.1563 C. 0.3125 D. 0.0313
Determine the vertex, focus, and directrix of the parabola and sketch its graph.(x + 4)2 = -12(y + 2)
A. vertex: (4, 2)
focus: (4, -1)
directrix: y = 5
B. vertex: (-4, -2)
focus: (-4, 1)
directrix: y = -5
C. vertex: (-4, -2)
focus: (-4, -5)
directrix: y = 1
D. vertex: (-2, -4)
focus: (-2, -7)
directrix: y = -1
Perform the operations indicated. Write your answer in simplest form.-84 ÷ (-3)
A. -28
B. 18
C. 
D. 28