Consider the solid gravity wall with an irregular backfill, two distributed loads, and one concentrated load shown below. The soil is a dry sand with a unit weight of $120$ pcf and an angle of internal friction of $30$ degrees. The angle of friction between the wall and the soil is assumed to be $20$ degrees. Use the trial wedge method to evaluate the factors of safety against overturning, sliding, and bearing capacity assuming that the subsoil has the same properties as the backfill.