Which of the variables in the model are related to Market?

The regression equation is Market = 3.49 + 0.0474 SqFt 0.000016 (SqFt)**2 + 3.16 Grade + 0.235 Assessed Predictor Coef SE Coef T P Constant 3.490 4.656 0.75 0.457 SqFt 0.047388 0.008069 5.87 0.000 (SqFt)**2 0.00001635 0.00000364 4.49 0.000 Grade 3.1564 0.9222 3.42 0.001 Assessed 0.23548 0.07019 3.35 0.001 s = 2.76470 RSq = 79.9% RSq(adj) = 78.4% Analysis of Variance Source DF 55 MS F P Regression 4 1672.00 418.00 54.69 0.000 Residual Error 55 420.40 7.64 Total 59 2092.40