Can someone please tell me the steps to solve this problem? I've looked through my textbook and I can't find help on it. ​

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?