How do you know you're good at sleeping page 65 solving inequalities

Im literally having a mental breakdown

Which point-slope form equation represents a line that passes through (3,-2) with a slope of -4/5

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.