Solve the problem.A certain radioactive isotope decays at a rate of 0.275% annually. Determine the half-life of this isotope, to the nearest year.
A. 252 yr
B. 109 yr
C. 182 yr
D. 3 yr
Answer: A
Mathematics
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Use the given values of a and b and express the given limit as a definite integral.
?xk, a = -5, b = 4
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.In how many ways can 4 people be chosen and arranged in a straight line, if there are 12 people from whom to choose?
A. 48 B. 19,958,400 C. 11,880 D. 39,916,800
Mathematics
Express the sum in sigma notation.- 
+ 
- 
+ 
- 
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.If the price for a product is given by p = 6400 - x2, where x is the number of units sold, then the revenue is given by R = px = 6400x - x3. How many units must be sold to give zero revenue?
A. 0, 6400 B. 0, 80 C. 6400 D. 0
Mathematics