Use $10\mathrm{.}4$ to answer $10\mathrm{.}5$ please. $10\mathrm{.}4$ The center of a rectangular area at ground surface has Cartesian coordinates $(0,0),$ and the corners have

coordinates $(7,18).$ All dimensions are in metres. The area carries a uniform pressure of $150$kPa. Estimate

the stresses at a depth of $20m$ below ground surface at each of the following locations: $(0,0),(0,18),(7,0),$

$(7,18),$ and $(12,28)$; obtain values by both Boussinesq and Westergaard methods, and also determine the

ratio of the stresses as indicated by the two methods. $($After Taylor, $1948.)$

$10\mathrm{.}5$ Compare the results of Problem $10\mathrm{.}4$ with those of the $2$:$1$ method. Comments?