Which set of ordered pairs below is a function?

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?