Im so tired of these problems and im almost done but dont know this answer

Describe the domain and range of y=2(3)^x-2+5

What is the difference between the predicted value and the actual value

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.