The American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 4747 who smoke. In an earlier study, the population proportion was estimated to be 0.30.3. How large a sample would be required in order to estimate the fraction of Americans over 4747 who smoke at the 85%85% confidence level with an error of at most 0.020.02? Round your answer up to the next integer.

Which system of linear inequalites is represented by the graph?

If eh = hg and hg=16, find the diameter of k

The rate of decay of a radioactive substance depends upon the amount present initially. the mass y (mg) of the radioactive substance cobalt-60 present in a sample at time t (years) is represented by the exponential equation y=50e −0.1315 t . answer the following questions in complete sentences. 1. how does the exponential equation above compare to the equation for simple interest that is compounded continuously? explain the similarities. 2. what is the initial amount of cobalt-60 in the sample? 2. how much cobalt-60 is left after 8.4 years? show your work. 3. what would be the y-intercept of the graph? what does it represent? 4. after how many years will the amount of cobalt-60 left be 6.25 mg? explain what happens to the cobalt-60 after 50 years? 5. discuss some “real-world” examples and uses of cobalt-60