Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 90% of the isotope left?
A. 527 yr
B. 246 yr
C. 1000 yr
D. 500 yr
Answer: A
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Solve the problem.Find the moment of inertia about the z-axis of a region of constant density ? enclosed by the paraboloid 
and the xy-plane.
A. 
??
B. 
??
C. 
??
D. 
??
Solve the problem.Suppose you borrow $1250 for a term of 12 years at simple interest and 2.15% APR. How much interest must you pay on the loan?
A. $322.50 B. $1572.50 C. $32.25 D. $268.75 E. $26.88
Solve. Write the fraction in simplest form.A company employs 165,000 employees worldwide. About 34,500 employees work in the United States. What fraction of the employees work in the United States?
A. 
B. 
C. 
D. 
By graphing the function, visually estimate its domain and range.g(x) = x2 - 1
A. Domain: [1, ?); range: (-?, ?) B. Domain: (-?, ?); range :[-1, ?) C. Domain: (-?, ?); range: (-?, ?) D. Domain: [1, ?); range: [1, ?)