Free points but not marking brainliest. Also btw can anyone give me 2 brainliest so I can level up?

What is the slope of a line that is perpendicular to y = 3x + 1

Which is the correct excel formula for the 80th percentile of a distribution that is n(475, 33)? =norm.dist(80,475,33,1) =norm.inv(0.80,475,33) =norm.s.inv((80-475)/33)?

Aline that intersects one of two parallel lines intersects the other also always sometimes never