Can someone find the acceleration of gravity from the slope and include units.

Period squared T^2 vs. Length (m) in Oscillations Lab O Period squared T^2 1.28*x + 4.59E-15 1.25 1.00 0.75 Period squared T^2 0.50 0.25 0.00 0.30 0.40 0.50 0.60 0.70 0.80 Length (m)