Domian and rangge plz URgent

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.

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

Can some one me with these questions