The document discusses determining support reactions for statically determinate structures. It notes that statically determinate structures will have a maximum of three support reactions. To determine the reactions, only the three equations of equilibrium are needed: the sum of forces in the x-direction equals zero, the sum of forces in the y-direction equals zero, and the sum of moments equals zero. Several example problems are then shown calculating the support reactions Rx, Ry, and moment M at each support.