Three problems I really need help with

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m

Which polygon is she in the process of constructing ?