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. An artifact is discovered at a certain site. If it has 56% of the carbon-14 it originally contained, what is the approximate age of the artifact? (carbon-14 decays at the rate of 0.0125% annually.) (Round to the nearest year.)
A. 3520 yr
B. 4480 yr
C. 2014 yr
D. 4639 yr
Answer: D
Mathematics
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Evaluate.0 ÷ 63
A. -63 B. 0 C. 1 D. undefined
Mathematics
Determine whether the statement is true or false.Every natural number of the form 4k + 5 is prime.
A. True B. False
Mathematics
Solve the problem.What is the additive inverse of 7 ?
A. 
B. - 7
C. - 
D. 0
Mathematics
Solve the problem.A study in a small town showed that the percent of residents who have college degrees can be modeled by the function 
where x is the number of years since 2005. Does this model indicate that the percent of residents with a college degree is increasing or decreasing?
A. Increasing B. Decreasing
Mathematics