Solve the problem.The loudness of a sound is measured in decibels (dB). The loudness L of a sound is related to its intensity I by the equation 
where I0 = 10-12 watts per square meter (W/m2) is the intensity of the faintest sound the human ear can detect. Find the intensity of a 60 dB sound.
A. I = 10-6 W/m2
B. I = -610 W/m2
C. I = 10588 W/m2
D. I = 1018 W/m2
Answer: A
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Solve the problem.A vendor has learned that, by pricing hot dogs at $1.25, sales will reach 134 hot dogs per day. Raising the price to $2.00 will cause the sales to fall to 101 hot dogs per day. Let y be the number of hot dogs the vendor sells at x dollars each. Write a linear equation that models the number of hot dogs sold per day when the price is x dollars each.
A. y = 44x + 79
B. y = -44x - 189
C. y = -44x + 189
D. y = - 
x + 
Calculate the unit vector u = (cos ?)i + (sin ?)j for the given direction angle.? = 
A. 
i - 
j
B. - 
i + 
j
C. 
i + 
j
D. - 
i - 
j
Find a polynomial that represents the area of the figure.
A. 21s7
B. 21s12
C. 
s12
D. 
s7
Provide an appropriate response.Are both 
and 
natural numbers, integers, or irrational numbers?
A. Integers B. Natural numbers C. Irrational numbers D. None of the above