Please help me asap
worth 15 points :)

This set of ordered pairs is a function (22,4)(21,1)(0,0)(1,1)(2,4) Please explain how this is a function.

will mark brainliest

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad