i_need_the_answer_quickly

Q1: determine the increase in vertical stresses at depth of Z=3.5 m under points A, B and C due to apply rectangular and ring foundations. The surface load intensity of rectangular is 250 kN/m?, while the surface load intensity of ring is 300 kN/m?.The drawing was done without scale and all dimensions in (m). R1 R2 X1 X2 B L 3 4.5 7.5 12 X1 X2 Aqs-net(2) R1 R2 Aqs-net(1) B B.