Solve the equation.
- 2 = x
A. 
B. 
C. 
D. - 
Answer: D
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Solve.Important news is said to diffuse through an adult population of fixed size L at a time rate proportional to the number of people who have not heard the news. Eight days after a scandal in the mayor's office was reported, a poll showed that half of the people had heard about it. How long will it take for 94% of the people to hear about it?
A. 34 days B. 29 days C. 35 days D. 32 days
Rewrite the following number using digits.One hundred million, six thousand
A. 1006 B. 100,006,000 C. 106,000,000 D. 1,600,000
Divide.(5 + 5i) ÷ (8 - 7i)
A. 
- 
i
B. 
C. 
+ 
i
D. 5 - 5i
Solve the problem.A certain radioactive isotope has a half-life of approximately 1600 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 80% of that amount?
A. 515 years B. 435 years C. 320 years D. 3715 years