2. the table shows the soil density of several soil samples at different depths. depth (m) 1 5 6 8 10 12 14 21 23 24 28 soil density ( ) 1045 1063 1102 1140 1191 1232 1249 1254 1265 1268 1273 (a) write the quadratic regression equation that models the data. let x = depth below the surface and let y = soil density. (b) use the equation to estimate the soil density of a sample at a depth of 20 m. show your work.