Solve the problem.The decibel level D of a sound is related to its intensity I by 
. If I0 is 10-12, then what is the intensity of a noise measured at 93 decibels? Express your answer in scientific notation, rounding to three significant digits, if necessary.
A. 1.09 × 1016 watt/m2
B. 2 × 10-3 watt/m2
C. 2 × 10-2 watt/m2
D. 9.3 × 10-10 watt/m2
Answer: B
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Give the measure of the missing angle using the similar triangles below.?ABC
?ABC ~ ?A'B'C'
A. ?ABC = 29° B. ?ABC = 58° C. ?ABC = 124° D. ?ABC = 27°
Write the phrase as a mathematical expression. Use x as the variable.135 added to a number
A. 135x B. 135 + x C. 135 D. 135 - x
Solve the problem. Round your answer to two decimal places.The area of a circle varies directly as the square of the radius of the circle. If a circle with a radius of 5 inches has an area of 78.5 square inches, what is the area of a circle with a radius of 8 inches?
A. 203.36 in2 B. 25.12 in2 C. 200.96 in2 D. 50.24 in2
A college sent a survey to a sample of juniors. Of the 620 students surveyed, 307 live on campus, of whom 139 have a GPA of 2.5 or greater. The other 313 juniors live off-campus, of whom 153 have a GPA of 2.5 or greater. What is the probability that a survey participant chosen at random has a GPA less than 2.5?
A. 
B. 
C. 
D. 
E. 