PLZ BIG BRAINS AWNSER THIS PLZ

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

If square root x = -7, then x= -49 true or false