WHAT ARE THE SOLUTIONS OF A QUADRATIC FUNCTION ALSO KNOWN AS? ALL THREE OF THEM PLSSS

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 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.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.