2.434 to 3 significant figures

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%

What are the solutions of the equation x4 – 5x2 – 14 = 0? use factoring to solve. someone !

Identify the number as a rational or irrational.explai. 291.87