2. Give a complete list of all the connected non-orientable surfaces with Euler characteristic -10, written in standard form. 3. Let T be a tree with an even number of edges. Show that I has at least one vertex of even degree. 2. Give a complete list of all the connected non-orientable surfaces with Euler characteristic -10, written in standard form. 3. Let T be a tree with an even number of edges. Show that I has at least one vertex of even degree