The document provides solutions to two problems (6.5 and 6.2) regarding composite material analysis. For problem 6.5, it calculates stiffness coefficients (Qij) for a two-layer composite with given material properties and orientations, and determines transformed stiffness coefficients and stress-strain relationships. For problem 6.2, it determines expressions for strains and curvatures on a middle surface with given displacement and rotation fields.