Solve the problem.The amount of a radioactive substance present, in grams, at time t in months is given by the formula 
Find the number of grams present in 2 years. If necessary, round to three decimal places.
A. 2.936 grams
B. 0.294 grams
C. 413.825 grams
D. 4138.255 grams
Answer: A
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Find the difference. Simplify the result.
- 
A. 
B. 
C. 
D. 
Solve the problem.A rat is placed at random in one of five compartments in a maze. Compartments 1, 2, and 5 have food; so the rat will remain at any of these once reached. If the rat is placed in compartment 4, what is the expected number of times it will be in compartment 4 before it finds food? Round your answer to the nearest hundredth. 1 2 345
A. 1.26 B. 1.23 C. 0.21 D. 0.31
Use the circle graph to solve the problem.A survey of the 7409 vehicles on the campus of State University yielded the following circle graph.
Together, what percent of the vehicles are either vans or convertibles?
A. 18% B. 9% C. 162% D. 27%
Solve the problem.The polynomial function 
represents the yearly income (or loss) from a real estate investment, where t is time in years. After how many years does income begin to decline?
A. 10 yr B. 9 yr C. 13.3 yr D. 20 yr