There was a sample of 900 milligrams of a radioactive substance to start a study. Since then, the sample has decayed by 2.19 each year. Letr be the number of years since the start of the study. Let y be the mass of the sample in milligrams. write an exponential function showing the relationship between y and t.​

Use the sample data and confidence level given below to complete parts a through d.a research institute poll asked respondents if they felt vulnerable to identity theft. in the poll, n=1090 and x=549 who said yes. use a 99% confidecne level.a. find the best point of estimate of the population of portion p.b. identify the value of the margin of error e.e= round to four decimal places as needed.c. construct the confidence interval._ < p < _ round to three decimal places.d. write a statement that correctly interprets the confidence interval.