Please explain the following. I have the Excel file but do not understand the meaning.

Sales Sales Squared Income Chart Title 0 0 -0.3 0.02 0.0004 14000 -5.7 0.15 0.0225 12000 27.5 0.61 0.3721 -124.5 10000 1.64 2.6896 -719.9 8000 2.76 7.6176 -1411.2 6000 3.12 9.7344 -567.3 4000 3.93 15.4449 -149.1 2000 5.26 27.6676 35.3 ........ ....0. . . . . . ..+ + +..+ + + . .. . . . . . . .(- -.+ +. . . . . . . .- . . . . . . . .- - - -Y-= 0.2764x2-+-30.671x .189.16 - 80 RX = 0.2594 6.92 47.8864 588.5 -2000 20 40 60 100 120 8.49 72.0801 359 -4000 10.71 114.7041 190 . Sales Squared Income .....*. Poly. (Income) 14.84 220.2256 476 19.17 367.4889 645 24.51 600.7401 902 SUMMARY OUTPUT 34.2 1169.64 1150 48.08 2311.6864 631 Regression Statistics 61.09 3731.9881 -39 Multiple R 0.50931622 74.45 5542.8025 274 R Square 0.25940301 88.99 7919.2201 241 Adjusted R S( 0.17711445 107.01 11451.1401 596 Standard Err 526.488068Chart Title 14000 12000 10000 8000 6000 4000 2000 0 ......... .....................-..=0.2764x3430.67 1x_- 189.16 + -2000 20 40 60 80 R2 = 0.2594 100 120 -4000 . Sales Squared . Income . ........ Poly. (Income)