An accident in 1986 at the chernobyl nuclear plant in the ukraine released a large amount of plutonium (pu-239) into the atmosphere. the half-life of pu-239 is about 24,110 years. use the function n(t)=n0 e^−kt. find the decay constant.

Of the following, which statement or statements accurately reflect a way in which credit can be safer than cash? i. if your credit card gets stolen, you can cancel it and get your money back. ii. it is harder to lose a single credit card than a large number of bills. iii. if a merchant does not honor the agreement, you can call the credit company and dispute the charges. a. i and iii b. ii only c. iii only d. i, ii, and iii