If x = 4 solve the following

17x = ​

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

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%

We just started the introduction into circles and i have no idea how to do this.