Despite your master page being in the root folder it is executed in the context of the content page you are viewing. So code like this
<img src="slider images/slider-86_3.jpg" alt="Image is Broken"/>
will work in a file in root as "slider images" is in root also, but when you look at a page in a sub-folder your url is now broken as there is no "slider images" in that folder. Use ResolveUrl to get the proper paths to your files instead of hard-coding them.
<img src='<%=Page.ResolveUrl("~/slider images/slider-86_3.jpg")%>' alt="Image is Broken"/>