Lol stop deleting my question noblepengiun

Which is an equation for the nth terms of the sequence 12,15,18,21

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

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion