Plz help me with this question

The function g(x) is defined as shown. x-1, -2 g(x) = 2x+3, -1 6-x, x23

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

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.