What is the domain and range of the best fit line?

What is the domain and range of the best fit line? Explain why this graph can or cannot  go any further  

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Given Time and situpsTime 0 15 30 45 65 75 90 105 120 Situps 0 10 20 30 34 39 50 60 64 Domain: Time: 0 15 30 45 65 75 90 105 120Range: Situps: 0 10 20 30 34 39 50 60 64The diagram as follows