Just P$4\mathrm{.}3$ please:

P$4\mathrm{.}3$A $$two$-$story $$building $$has $$pressures $$acting $$on $$its $$front $$and $$back walls $$as $$shown $$in $$the $$figure$.$The $$building $$will $$also experiencean $$internal $$pressure $$that $$can $$act $$either $$into $$or $$out $$of $$the $$faceof $$the $$wall$.$Sketch $$loading $$diagrams $$for $$a $1\mathrm{.}0$ft $$wide $$strip $$ofthe $$front $$and $$back $$walls $$if $$a $$positive $$internal $$pressure $$of $5\mathrm{.}3$ psf exists. This $$means $$that $$the $$pressure $$on $$the $$inside $$of $$thebuilding $$will $$act $$into $$the $$wall$.$