Find the sum of the series.
A. 45
B. 63
C. 81
D. 126
Answer: D
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Which of the following is the BEST example of a firm's investment in a "real option?"
A. Amazon purchases a vacant building and uses it for a new distribution warehouse. B. Coca-Cola continuously invests in marketing in order to strengthen its global brand image C. A pharmaceutical company develops a variety of drugs in the hope that one of them might become a "blockbuster" that cures a life-threatening illness D. All of these are good examples of real options
Solve the problem.A sample of 600 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 20 years? Round to the nearest whole gram.
A. 0 g B. 1 g C. 244 g D. 778 g
Find the specified minor and cofactor for the matrix A.M11 and A11 if A = 
A. M11 = 32 and A11 = - 32 B. M11 = 32 and A11 = 32 C. M11 = -23 and A11 = -23 D. M11 = 23 and A11 = 23
Add or subtract. Simplify the answer.
- 
A. 1
B. 17
C. 
D. 