Solve the problem.Find the half-life of the radioactive element radium, assuming that its decay constant is 
with time measured in years.
A. 1400 years
B. 1600 years
C. 800 years
D. 2308 years
Answer: B
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Solve the problem.Maria, Daniel, Stephanie, Michael, Elena, Tyler, Sue, and Dimitri have reserved eight seats in a row at the theater, starting at an aisle seat. In how many ways can they arrange themselves if Maria and Daniel are to sit next to each other?
A. 1440 B. 5040 C. 10,080 D. 11,520
Solve the problem.Rule: The numbers in the big circles are the sums of the numbers in the two small adjacent circles. Use this rule to complete the array.
A. 
B. 
C. 
D. 
Solve the problem.An employee was paid $20,625 during the first half of last year. During the second half he was paid $40,858. How much more was his income during the second half?
A. $61,473 B. $20,233 C. $20,223 D. $61,483
State whether the function is a polynomial function or not. If it is, give its degree. If it is not, tell why not.f(x) = 1 - 
A. No; x is raised to the negative 5 power
B. Yes; degree 
C. Yes; degree -5
D. Yes; degree 5