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 65% of that amount? Round to the nearest year.
A. 2423 yr
B. 929 yr
C. 994 yr
D. 560 yr
Answer: C
Mathematics
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Solve the problem by integration.Find the volume generated by revolving the first-quadrant area bounded by 
and 
about the 
A. 
?
B. 
?
C. 
?
D. 
?
Mathematics
Solve the application.The circle graph shows the fraction of books read by students in grades one through five. What fraction of books was read by students in third and second grades combined?
A. 
of books
B. 
of books
C. 
of books
D. 
of books
Mathematics
Translate to a proportion and solve. 66
% of what is 934?
A. 1401 B. 622.67 C. 14,010 D. 140.1
Mathematics
Add or subtract. Simplify all answers. Express as a mixed number.11
+ 19
A. 31
B. 30
C. 29
D. 11
Mathematics