Aline has a slope of -6 over 7. what is the slope of the line parallel to it? and what is the slope of the line perpendicular to it?

Me answer number 3plz explain how you do it

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

What situation is an example of an observational study