What is 21 because what it is

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

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.