$2\mathrm{.}1(5$ points$)$ How many degrees of freedom do you have.

Find the element strength matrix for each element of $2\mathrm{.}2(5$ points$).$

Describe the boundary conditions that apply to the $2\mathrm{.}3(5$ point$)$ hodes $1,2,3,$ and $4.$

Use the $2\mathrm{.}4(5$ points$)$ superposition concept $($direct stiffness$)$ to find the entire stiffness matrix.

Add a $2\mathrm{.}5(5$ points$)$ boundary condition and find the displacement $($d$)$ at each node.

Find the reaction force at the $2\mathrm{.}6(5$ point$)$ nodes $1$ and $4$ and verify that the sum is $500$ N given.