Of course you should. Sharpen in the same manner as any blade making sure it is balanced when finished. Make note that some mulching blades have 2 cutting edges. Sharpen those using the same method.
Yes.
The best thing to do on an ineffective lawnmower blade is to replace it.
Firstly, to sharpen the mower blade, remove it from the lawnmower and get any rust off with steel wool. Clamp the blade down and run along it a file. For badly damaged blades, it would be best to take it to a professional.
A mulch blade works well on a riding lawnmower.
It is recommended that you should sharpen your circular saw about once a year. However if you are a heavy user of your circular saw then you should sharpen once every six months.
Yes, well if it gets blunt... Why shouldn't you?
Yes, you sharpen both blades. Professional blade sharpeners refer to the set as a "clipper blade".
to sharpen (a knife or any blade) is "aiguiser" in French. To sharpen a pen is "tailler un crayon".
A razor strop is used to sharpen single blade razors, otherwise known as cut throat razors. The blade is passed against the strop multiple times to sharpen the blade.
under the mower above the blade should be a allenhead plug
You get another blade and blunten it
give it to a practitionist.