The most recent poll of 50 randomly-selected members of a school club with a total of 80 members showed that 38 are planning to vote for talia as president of the club. talia correctly determined that the margin of error, e, of the poll using a 95% confidence interval (z*-score 1.96) is approximately 12%. what is the 95% confidence level for students who are planning to vote for talia as president of the club? c = + e between 26% and 50% between 38% and 62% between 51% and 75% between 64% and 88%

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.