Please help me solve the last problem along with the second please. HW $1$ Axially Loaded Members

For the problems given below, determine the reaction $A($find reactions at A and $D$ for the last problem, which

is statically indeterminate$)$ and draw the axial force, stress, strain and displacement diagrams. Use the principle

of superposition for the last problem to find the reaction at $D$ first, then use statics to determine the reaction at

A$.$ Note the different cross$-$sectional areas A and, for the $3$rd problem, in addition to changing areas, various

materials as indicated by the different modulus of elasticity $E$ values.