Solve the problem.A radioactive substance is observed to disintegrate at a rate such that 
of the original amount remains after one year. What is the half-life of the substance?
A. 0.556 yr
B. 0.301 yr
C. 6.579 yr
D. 0.588 yr
Answer: C
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Find the foci of the hyperbola.x2 - y2 = 128
A. (16, 0), (-16, 0) B. (8, 0), (-8, 0) C. (0, 8), (0, -8) D. (0, 16), (0, -16)
Refer to the double-bar graph below which shows the number of male (M) and female (F) athletes at a university over a four-year period. Solve the problem. 
YEARFind the increase in the number of female athletes from 1986 to 1987.
A. 50 B. 100 C. 200 D. 75
Find the book value to the nearest dollar.Cost $8,100, life 4 years, scrap value $405 at the end of 3 years, sum-of-the-years'-digits method
A. $4,050 B. $2,329 C. $2,025 D. $1,175
Solve the problem.A study of grocery buying habits in a particular region stated that for the years 2001 - 2005, the annual number of new family-run grocery stores can be estimated by the model 
where x is the number of years after 2000. Graph this model by hand and use the graph to predict the number of family-run stores that will start up in 2008.
A. 1130 stores
B. 830 stores
C. 2290 stores
D. 1630 stores