Given the following parameters, what is the minimum thickness $(x)$ of the wall to resist overturning $($FS $2\mathrm{.}0)$ and sliding $($FS $1\mathrm{.}5)?$ The wall height is $20$ feet.

$\backslash$table$[[,$THICKNESS $($ft$),(pcf),{}_{\text{s}\text{a}\text{t}}($pcf$),()$