PLEASE ANSWER WILL MARK BRAINLIEST!! The table shows the soil density of several soil samples at different depths.

(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.

(a) y = -0.4931x² + 23.3798x + 996.0289

(b) x = 20

y = -0.4931x² + 23.3798x + 996.0289

y = -0.4931(20)² + 23.3798(20) + 996.0289

y = -0.4931(400) + 467.596 + 996.0289

y = -197.24 + 467.596 + 996.0289

y = 1266.3849

v = 1/3 a^2h

step-by-step explanation:

if the height is 57.7cm and the height of the slant edge is 18.2cm, then the volume is 1/3 a^2h.

a = 3.14

b = 18

c = 18/5 or 3.6 or 3 3/5

step-by-step explanation: