The function 
represents the relationship of the time in years, t, and the amount of radium-226, y. Find the half life of radium-226 in years. Round to the nearest tenth.
A. 1589.8 years
B. 1589.7 years
C. 159.0 years
D. 158.9 years
E. None of these
Answer: A
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Use the substitution formula to evaluate the integral.
A. - 
B. 
C. - 
D. 
Use the figure to find the exact value of the trigonometric function.Find tan 2?.
A. 
B. - 
C. 
D. - 
The following stem-and-leaf plot gives the heights of the 20 highest mountains in two continents. Use the plots to answer the question. 
For which of the two continents is there a smaller range of heights in its 20 highest mountains?
A. Continent Y B. Continent X
Find the absolute maximum value and the absolute minimum value, if any, of the given function.
?
?
A. Absolute maximum value: 
; absolute minimum value: none
B. Absolute maximum value: none; absolute minimum value: 0
C. Absolute maximum value: none; absolute minimum value: 
D. No absolute extrema