(3\5x+3/4)-(1/3x-1/8) PLEASE HELP (the slashes are fractions)

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.

Find the domain of the following expression: 1/(√x)-2

For what type of equity loan are you lent a lump sum, which is to be paid within a certain period of time? a. a line of credit b. equity c. a second mortgage d. an amortization