PLZ answer this for me its urgent PLZ needed Now!

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.

Which expression is equivalent to? assume x > 0 and y > 0.

At his new job, jeremiah can choose an hourly rate of $9 plus a $50 weekly bonus for opening the store, or an hourly rate of $10 per hour with no opening bonus. the equations model his salary options. y = 9x + 50 y = 10x