WILL MARK BRAINLIEST-15 POINTS
The table shows the soil density of several soil samples at different depths.
Depth (m) Soil Density (kg/m3)
1 575
5 589
6 605
8 810
10 967
12 1215
14 1400
16 1450
18 1800
20 2100
21 2508
a) Write the quadratic regression equation that models the data, and round all numbers to the nearest tenth. Let x = depth below the surface and let y = soil density. You should use technology to find the equation. Please upload the Excel file you used to find the trendline. Submissions without the Excel file will not receive credit. YOU HAVE TO INCLUDE EXEL FILE

b) Use the equation to estimate the soil density of a sample at a depth of 28 m, round to the nearest whole number.

c) Use the equation to find the depth of a sample with a soil density of 2600 kg/m3, round to the nearest whole number.