Simplify.
A. 80
B. 48
C. 30
D. 32
Answer: D
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Simplify.
A. 
B. - 
C. 
D. - 
Consider the sets X and Y. Write the statement in symbols. ? The complement of the intersection of X and Y. ?
A. 
B. 
C. 
D. 
E. 
Solve the problem.The half-life of an element is 5.8 x 108 yr. How long does it take a sample of the element to decay to 
of its original mass? (Express results in scientific notation, rounded to the nearest hundredth.)
A. 4.27 x 108 yr B. 6.13 x 108 yr C. 1.06 x 108 yr D. 2.05 x 108 yr
Solve the problem.What is the intensity in Watts/m2 of a noise measured at 57 decibels? The level of sound intensity in decibels (dB) is 
where ? (beta) is the number of decibels, I is the sound intensity in W/m2, and I0= 
(Round to the nearest hundredth.)
A. 5.70 × 10-10 W/m2 B. 5.01 × 10-6 W/m2 C. 2.99 × 1014 W/m2 D. 5.01 × 10-7 W/m2