Taking force , length and time as fundamental quantity , find the dimensional formula for density

This is the substance(s) formed in a chemical reaction.

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.

If anyone who can me with this hw? i would really appreciate it