anthonylopez1
12.03.2021 •
Mathematics
PLEASE HELP, 30 POINTS)
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 ((mg/cm^3) 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.
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Ответ:
Step-by-step explanation:
2(x^2 +16 -8x)=100
2x^2 -16x +32 =100
2x^2 -16x -68
2(x^2 -8x -34)
then use quadratic formula, which is way too complicated to write in words