Can someone help, I don’t know what I’m doing wrong. Given the following least-squares regression line, how many seconds does this model predict a 7-foot pendulum would take to complete one period?

What are the domain and range of the function below? a) domain: (-4,0) range: [-2,infinity) b) domain: (-3,0) range: [-2,infinity) c) domain: (-infinity,infinity) range: [-2, infinity) d) domain: [-2,infinity) range: (-infinity,infinity)