What is BC?

Thank you for anyone who answers

Its worth 10000000 points need asap if you answer correctly ill mark brainliest

State if the two triangles are congruent. if they are, state how you know?

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%