Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t, and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.275% annually. Determine the half-life of this isotope, to the nearest year.
A. 182 yr
B. 3 yr
C. 252 yr
D. 109 yr
Answer: C
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Name the quadrant in which the point is located.(4, -6)
A. I B. II C. III D. IV
Even with most of the problem missing, it is possible to tell whether a suggested answer is reasonable. Determine whether the answer given is reasonable. If it is unreasonable, move the decimal point or insert a decimal point to make the answer reasonable.What was the price of the book?$16
A. Unreasonable, should be $1600
B.
| Reasonable |
C. Unreasonable, should be $160
D. Unreasonable, should be $1.60
Use the addition rule to solve the problem.A card is drawn from a well-shuffled deck of 52 cards. What is the probability of drawing an ace or a 6?
A. 
B. 
C. 7
D. 
Solve the problem.During a five-year period, a company doubles its profits each year. If the profits at the end of the fifth year are $224,000, then what are the profits for each of the first four years?
A. $14,000, $28,000, $56,000, $112,000 B. $15,000, $30,000, $60,000, $118,000 C. $14,000, $28,000, $42,000, $56,000 D. $14,000, $28,000, $56,000, $140,000