What is the mean for this list of numbers? 4, 8, 18

Match each inequality to the number line that represents its solution

What is the distance between a and b? round your answer to the nearest tenth. a coordinate plane is shown. point a is located at negative 1, 5, and point b is located at 4, 1. a line segment connects the two points.

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1