Help pls this is 20 points

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

What is the perimeter of an equilateral triangle if each side is (x+3)?

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.