A large sponge has forces of magnitude 12 N applied in opposite directions to two opposite faces

Question:

A large sponge has forces of magnitude 12 N applied in opposite directions to two opposite faces of area 42 cm2 (see Fig. 10.7 for a similar situation). The thickness of the sponge (L) is 2.0 cm. The deformation angle (() is 8.0°.
(a) What is Δx?
(b) What is the shear modulus of the sponge?