Can someone help me please?

100 points, hi, i’m not sure how to get the equation from the graph and table.

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.