Luisa is avid horseback riding. this year, she purchased a new safety riding helmet for $125 and continues taking lessons at $20 per lesson. her parents say that she cannot spend more than $800 on riding this year. write an inequality that represents luisas horseback riding expenses for the year.

How to determine whether two known pairs of points are on the same line.

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 values of each variable in the diagram below?