Determine whether QR and ST are parallel, perpendicular, or neither. Q (-8, 7). R(-7, 2)S(-8, 13), T(-11, -2)

The longer leg of a 30-60-90 trangle is 18

The data set represents the ages of players in a chess club. 27, 34, 38, 16, 22, 45, 54, 60. what is the mean absolute deviation of the data set?

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?