Solve the problem.A fossilized leaf contains 25% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the half-life of carbon 14.
A. 25,959 years old
B. 34,818 years old
C. 2320 years old
D. 11,180 years old
Answer: D
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Write the expression using a single radical sign. Assume that all variables represent positive real numbers. Simplify the radicand if possible.
A. 
B. 28
C. 
D. 216
Use Bayes' rule to find the indicated probability.Two stores sell a certain MP3 players. Store A has 34% of the sales, 5% of which are of defective items, and store B has 66% of the sales, 1% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives a defective item of this product as a gift. What is the probability it came from store B?
A. 0.275 B. 0.22 C. 0.5667 D. 0.7083
Each matrix is nonsingular. Find the inverse of the matrix. Be sure to check your answer.
A. 
B. 
C. 
D. 
Approximate the number using a calculator. Round your answer to three decimal places.e3.6
A. 9.786 B. 36.598 C. 32.523 D. 36.898