help me plz
Extracted text: Om 10m 20m 17.07m DATUM Ye=18.86KN/m³ K = 10*m/sec Impervious (a) The elevation head, total head, and pressure head at B. (b) The pore water pressure at B. (c) The exit hydraulic gradient (iexit) and the critical hydraulic gradient (ier). (d) Determine the factor of safety against a quick sand condition. Hint: (1) For the iexit calculation, choose the least water flow length, L. (2) FOS = iexit / iç where if FOS is less than 4, the quick condition occurs %3D 18.60m 12.80m 9.14m