Can someone me understand this question and answer it for me with details! !

How do you solving the solution of each system using elimination?

Which strategy is used by public health to reduce the incidence of food poisoning?

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.