Radioactive element A decays to the stable element B with a half-life T. Starting with a sample of pure A and no B, which graph below correctly shows the number of A atoms, NA, as a function of time t? 
Definitions:
Zero Coupon Interest Rate
A rate of interest reflecting the discount from par at which zero-coupon bonds are sold. This rate is not paid annually but at maturity.
Arbitrage Profit
Profit earned from buying and selling the same asset in different markets to take advantage of differing prices for the same asset.
Stock Index
A measurement of a section of the stock market calculated from the prices of selected stocks, representing a specific market or sector.
Futures Contracts
Financial contracts obligating the buyer to purchase an asset or the seller to sell an asset, such as a physical commodity or a financial instrument, at a predetermined future date and price.
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