Solve the problem.What is the intensity in watt/m2 of a noise measured at 80 decibels? D = 10 log (S/S0), where S0 is 10-12 watt/m2. (Round to 3 significant digits.)
A. 2.98 × 1015 watt/m2
B. 1 × 10-3 watt/m2
C. 1 × 10-4 watt/m2
D. 8 × 10-10 watt/m2
Answer: C
Mathematics
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Simplify the complex rational expression.
A. 
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Write the number using digits.six hundred thirty-eight thousand, nine hundred ninety-seven
A. 638,997,000 B. 638,977 C. 638,997 D. 638,000
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What does the circuit symbol in the figure mean?
A. NOT-gate B. OR-gate C. AND-gate
Mathematics
Find the equation of the least squares line.Two separate tests are designed to measure a student's ability to solve problems. Several students are randomly selected to take both tests and the results are shown below. 
A. y = -0.930 + 19.4x B. y = 0.930 - 19.4x C. y = 19.4 + 0.930x D. y = -19.4 - 0.930x
Mathematics