$[$iii$)$ the compression index Cc

$($iv$)$ The recompression index Cr

use the equation for strain in the photo to calculate these, where:

$C^{*}$ is either $C$c or $C$r as appropriate

$E_0=$ inital void ratio $=1\mathrm{.}776$

sigma v$0\text{'}=$ initial vertical effective stress

delta sigma v$\text{'}=$ change in vertical effective stress

the clay has unit weight$=16\mathrm{.}5\frac{kN}{m^3}$

and water table is at $0\mathrm{.}5$m