What is the vertex of f(x)=x2−12x+25 ?

Write the converse of the following statement: if the trees have no leaves, then it is fall. if the trees have no leaves, then it is fall. the trees have no leaves, therefore it is fall. it is fall since the trees have no leaves. if it is fall, then the trees have no leaves.

How is this equation completed? i cannot find any examples in the book.

Can someone tell me if these are correct?