Can someone help me find the values of y and z?

And employees salary increase by $4500 which represents a 15% raise what is the employees new salary

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)