precalculus question please show how to solve step by step.

Use the following information to answer questions 1 and 2. The radical function, f(x), is defined as f(x) = 4-x-7. In the table below are possible forms of domain and range for f(x). Reference Number 1 2 3 X 1. 4 Form (-, -a) (-, -a) (-, a) (-,a] Reference Number 5 6 7 8 Form (-a,) [-a,0) (a,0) [a,0) .../1 The domain of f(x) has the form with reference number n and the value of a, where aeN, in the form, is a. Record your answer in the form of na as a two-digit number.